DoorDash Sole proprietorship

Hey So I'm 19 years old and I'm planning on next month going out for my full drivers  license and then starting my business as a sole proprietor, then getting a personal loan of $20,000 to purchase a hybrid car, to that i wont  have to finance and my insurance to be sky high and then  to be a full time doordasher. My question is will i be able to get the business use of vehicle tax write offs for section 179 were I read I can deduct up to $18,000 of the purchase price if it is used for 100 percent business use. Which I Plan to use it for 90 percent business and 10 percent personal is this the right way to go about this? because I know in my area the hours I would put in would average $1,000 a week easily.  Someone help and let me know if I'm going about this wrong. So my total expenses would be $650 a month with the loan and insurance and my current bills included.