There are many ways to become a car mechanic. Many colleges offer mechanic courses that you can complete, but as with many professions, this career is best learn on the job. As manufactures are always bring out new car models and technology, you need to keep up to date with the industry changes. Some car garages will offer the chance for an apprenticeship. This is where you can learn on the job whilst being paid for the work you do. The wage is often quite a lot less than a fully trained mechanic, but does mean that some people can afford to move in to this type of career.
Being a mechanic can be a very exciting job and also rewarding, but you also have the added bonus of being able to fix any issues with your own car or possibly close friends and relatives cars. Contact a few local garages to see if they would be willing to take on an apprentice.