Mobile mechanic business in Texas

Alrght y'all I've got a good idea of what's going on but I'm not 100% sure how to go about this. I got my EIN for sole proprietorship and don't touch anything that's risky till I get insurance. I have 20 years experience and have worked at dealerships but been doing my own thing for a while now. Obviously I should probably get insurance but what all can I write off? Should I get different insurance to drive my work vehicle? Obviously I'm going to get an account and card specifically for business expences such as gas, tools, clothes and meals. What else should I consider or do?