Honestly, just try and avoid aggressively using gendered pronouns as the default. It's not the end of the world if you do, but if you just stick with using they/them and names until you've had a chance to pick up on the social cues, you'll be fine. And if it's in a situation where no one knows anyone else, and where the social cues aren't giving you the answer, then yeah, that's the time to lead with your name and pronouns.

But none of it's a big issue. Trans folk feel it when you get it wrong. We notice, but we also understand that sometimes mistakes happen, especially in a society that has taught everyone to associate pronouns and assumed gender. What's important isn't that you get it right every time, what's important is that you pay attention when you get it wrong, and do your best to get it right from then on.

People will sometimes introduce themselves with pronouns, or sometimes wear little badges with them.

There are definitely people IRL who don't use the pronouns one might guess by looking at them. I haven't met many (any?) people who go by neopronouns, but they are around the Internet.

You can often just guess pronouns for people, but if you can't read the gender someone is presenting (is your new friend rocking a kilt, sports bra, and enormous beard?) it might be polite to ask, and/or to use "they" until you get the right one.

You don't have to want people to call you he/him just because you are a man. But he/him is overwhelmingly popular with men, so it's a fine choice.

If there is a field for pronouns, and you want people to know yours instead of them having to guess, you should put yours in there. The other reason to put pronouns in, even if people are likely to guess right, is to exercise the field for the people who often get guessed wrong.

I’m just a straight male. Are my pronouns he/him?

If you want them to be.

Is that how I should tell people? Do you actually tell them as you meet them ? Do I have to wait for a certain social cue ?

A decent social cue to use would be if someone has mistakenly used one of the 'default' pronouns (he/him or she/her). Just be polite and understanding about it.

And about respecting other people’s pronouns. How do i figure them out ? Is it a big faux pas if I don’t before I know them ? Is it a faux pas if I refer to someone I just met and I assumed to be male as he/him?

You don't know what you don't know. The only people who would give you shit before you could have reasonably known would be, frankly, someone looking for drama/a fight. Treat those people accordingly.

I’ve never seen anyone referring to anyone irl by non conventional pronouns. Is it an actual thing or is it currently being pushed to make the world a more inclusive place?

It is worth keeping in mind that we are talking about a relatively small crowd of people that identify as non-binary or use non-standard pronouns. It is pushed mainly because it prevents exclusion for these people and honestly it costs nothing anyway.

It's also handy for the trans crowd, as although they may use standard pronouns, they might not be the ones they currently appear as.

If I’m asked then I say my pronoun is his royal highness.

I call others by their cis gender unless either it’s obvious like wearing a dress or corrected. People can choose how they want to be addressed but shouldn’t expect me to know lol.

One extra note on using they them when you don’t know: No, I’m going to assume that the person is not in the 2% of people that look like one gender and aren’t.

You can normalize preferred pronouns by declaring them when you introduce yourself. Eg. I’m Barry and my pronouns are he/him. That’s being a good ally.

If you get someone’s pronoun wrong, it’s no big deal as long as you don’t keep pushing it. They can correct you and you should just use their pronoun after. The most important thing is to use the correct pronoun once told.

You can also ask if a person you have just met has preferred pronouns.

I am a straight male

Being straight doesn't impact what your pronouns are! Your gender, whether you are cis, non-binary, trans, or any other gender identity is what determines these pronouns.

are my pronouns he/him?

Probably but thats up to you. Usually pronouns are given in that order as a matter of standardisation for understanding where they go in a sentence. Ie "He is going to the store" or "it all comes down his choice." Obviously this leaves out some other gendered standard pronouns like formal Sirs and Ma'ams but for most conversation knowing she/her or they/them gets you most of the way there. For standard ones it might be intuitive but for people with neo-pronouns it helps a lot.

do you tell people when you meet them?

Sometimes. I try to do it more these days as a matter of course but usually I will give them when I'm in an environment where some people do and don't where no one does. They are in my email signatures and real social media bios though.

Online rules

At least on your profile somewhere. I like Hexbear's "no exceptions they will be in your name" policy, its better for uptake and helps people feel included.

figuring out others

If it isn't clear you could always ask. If you aren't a dick about it then it's usually fine. If you get corrected though the most respectful thing you could do is just say sorry and use the right ones from that point on.

non conventional pronouns

Yes people do use them, if you are in places that queer people go to or feel comfortable you are more likely to meet someone with them. I would argue its more polite to refer to them as neo pronouns but I also have boring ones so its not really my place to say. If you look around hexbear there are a couple of frequent posters with neo pronouns and I've known a few people irl to use neo pronouns as well.

Trans woman here. Your pronouns are he/him unless you’d rather be addressed with other ones. There’s multiple ways to handle exchanging them but one of the popular strategies is look at how a person is presenting, how gendered their name is, etc and if it seems pretty strongly leaning one way you can guess otherwise give your pronouns and they give theirs in return. At least that’s what I do.

answering your questions as best I can (I'm a straight male too) in order:

1. if he/him seems right to you, then your pronouns are he/him. if other pronouns seem right to you, then your pronouns are those pronouns. pronouns don't have to match up with your gender or presentation, go with whatever you vibe with
2. when meeting new people, I give my name and pronouns. "hi, my name is salarua and my pronouns are he/him." of course, it's nice to give your pronouns when asked, but other than that it's up to you
3. just including your pronouns in your profile is good. some people put them in their nicks, some in their bio or about me. if you have a Mastodon, Akkoma, Misskey, or Firefish account you can put your pronouns in your custom fields
4. you can try and figure out other people's pronouns from how other people refer to them. many people will also give their pronouns if you introduce yourself with your pronouns. it's not a faux pas to not know someone's pronouns beforehand, although I admit I don't know a non-awkward way to ask someone their pronouns
5. a good bet is to refer to people whose pronouns you don't know as they/them. if you mispronoun someone by mistake, quietly correct yourself and continue with whatever you're saying. "so after arriving at the office, he- sorry, they went to go see their supervisor about the presentation..." as long as it's not done out of malice, people don't mind being mispronouned if you acknowledge the slip-up and move on
6. I haven't met anyone irl with neopronouns either. presumably people with neopronouns would go by them if they were among people they felt safe with. unfortunately most of the world isn't safe :(