Savage, Grumpy is correct. I wrenched for 30 years in all kinds of shops. I was never really happy unless I was working for myself. Get some experiance, do good work for a fair price, and you will have more work than you ever want to do. My biggest beef with some of the other mechanics I have known, is that they would not own up to there screw ups. They would make up an excuse and charge you again.
I for one, on many occasion would go tell the foreman that I just F'ED something up and then I would fix it on my dime. They may not like it, but they, and the customer will respect you. You will have made a customer for life and he will send all his friends.
Be fair and honest and you can do very well.
Don't fall into the trap of buying everything off the tool trucks. Sears is ok and has the same warranty. I have 40-50k of tools in my garage that are now worth pennys on the dollar. After 30 years I would be lucky to get 5K for them. Buy someones used tools. You will save a ton of money.
Since I retired a few years ago, it has again become fun to work on my toys.