+1 on everything stated above. Explore your local market. Find out what the local production shops are getting, find out what the Craigslist clowns are getting, then set your standards above all of them. Its hard to get established these days with so many guys doing it. I do suggest you look deep into the legal aspects of this as well. When you figure in your REAL overhead, you might realize its going to cost a lot more than you originally thought. Figure 20% of everything you make going straight to Uncle Sam. Then figure in liability insurance (yes you need it). Fuel and vehicle upkeep, more insurance, etc for the mobile unit, plus feeding your new addiction to detailing products and equipment. Figure all that in, now add your monthly living expenses. It sucks, but it can be done. You just have to run a very efficient and profitable business. If your serious about this, I suggest taking a couple business classes. Thats something I wish I had done differently and always suggest to people looking to get into this as a full time gig. Its a long uphill climb if you don't have your ducks in a row to begin with.