You get a job as an oil tech sweeping floors and if you aren't an idiot, you will learn on the job and study. Eventually you take the ASE certification tests and are then a mechanic. If you are looking to get into a performance shop, this is the best route to go because you will learn specialty knowledge and can eventually be paid well, but those jobs are hard to get and you have to really make an effort and put up with a lot of shit to get to a great place in your career.

You can do college courses to get a degree and then pass ASE certs. You can then get a job in a shop and will have to prove you aren't just someone who can pass a test before you are actually a mechanic.

There are trade schools, which you can get scholarships for or be sponsored to go to. The sponsorships usually come from working in a dealer shop, some sponsorships are for secondary trade schooling(like diesel tech) and they pay for the secondary schooling and will give you a job for a certain number of years after under contract. I know a few people who had Ford pay for their diesel program, one is doing really well for himself and the other failed out because of a girl and was on the hook for thousands to pay back Ford.

If you want to make great money, you will have to work for 5+ years in an Audi dealer and then can try to work for an exotic car dealership. You can work for an exotic dealer with experience from a brand like Toyota with a degree or the right trade school, but you are less likely to get the job.