I am a senior in high school and want to buy my first car how much of a down payment do I need to make

I'm not sure

Depends on price of the car and where you finance it.

Buy as much of Car Can You Afford, The more you put down the less the payments will be. Most people put down 10%, the normal is 20%. You are younger the lender may want more of a down payment.

Buying you first car with no credit history may be interesting.

Unless it's 40% interest "Hey, come on down, we carry our own contracts! We finance anybody! We take anything in on trade! Even a pig! Seriously, get a co-signer or work and save for a year