Auto paint help?

so found a friend who has a paint booth and a spray gun setup.





if i were to paint a 1978 camaro black how much paint would i need to buy and about how much would it costAuto paint help?
Friend should know. Also you are gonna have to cough up for reducers, washers, tack rags, sandpapers, masking tape and other additives so it isn't so easy as grabbing a gun. I found it cheaper to do my car with spray bombs than buy all that stuff. I still needed the tape and sandpaper and tack rags but 14 spray bombs later my car went from flat silver to Corvette yellow.(so under 50 bucks--compared to 250 for paint alone... and touch up paint was always available).Auto paint help?
A gallon is what you need and it would cost you about 300 bucks for some good paint. Don't waste your time with the cheap junk.