Hire an accountant. It is worth what you pay them to keep the feds off you back.
Trucks, as long as it is used only for "business" all expenses are deductible. Purchase price is deductible depending on price. Check with your accountant. If over a certain amount the deduction has to be spread over several years. A dual use vehicle, business and personal, you need to keep up with the mileage and either claim personal mileage as income or business mileage as deductible. Personally I find it easier to have a business only van and write off all expenses. Call an accountant.
Do not run your business out of your personal checking account. Run a separate account and use it only for business. We pay everything with debit cards, that way you have a record of all purchases. Call an accountant
Usually racing and other activities are only partially deductible. Expenses to and from the track, hotel, food probably is deductible. The car, probably not. Call an accountant.
My recommendations on incorporating, do an LLC, you get the liability protection of a S-Corp or a Inc., but the tax advantages of a sole proprietorship. We did ours through Legal Zoom. Easy and cheap, about $400.00. Call an accountant.
What ever you do call an accountant. Mine charges me about $100.00 per month to handle all taxes, personal and sales, EOM reports, EOQ reports, and payroll taxes and withholding as well as business licensing is about 30 towns and cities. I receive the appropriate forms on my desk with a post-it note telling me how much the write the check for and the address to send it to. The two audits we have had were no problem.
Oh and have I mentioned, CALL AN ACCOUNTANT. Most of them will meet with you and offer suggestions for starting a business for next to nothing. The smaller firms want to help you get started to add a customer.
My .02, and it is worth what you paid for it.
Call an accountant. Make sure they do business taxes. H&R Block won't cut it.