Gettign ready to paint, need vital info
 

Ok im planning out the painting of my fc and have some vital questions.

First of all, I am going to wetsand my existing paint and then spray over it without primer.

1)How much paint will i need, and how many coats should i use?
2) same as 1 but applied to clearcoat
3)what size tip should i use for the paint a clearcoat
4) Should i wetsand the paint before clearcoat(ive asked and gotten mixed answers, i didnt think so)
5)I read i am supposed to keep the gun 90 degrees from the surface to insure even paint, How do i paint the roof ???
6)If i have bondo in some places and have to put primer over it, will this show through the paint if sanded properly?
7) what grit should i use to wetsand the current paint?

Thanks in advance, i know its alot of questions but im just tryna do this right.