All depends what paint ur usin thou!!!!!!!!!!!!!!!

Distance is roughly a hands span away from the panel

Coats depends WHAT paint ur using, if straight colour 2pack then a 1/2 coat and full coat, and if needbe another full coat but doin that you could cause mega waves/runs!
Basecoat if its solvent then 2-3, waterbased they say u can get away with 1 1/2 coats then a grip(light) coat with the laquer then a full coat, and another if u feel u need it.

most you want the gun on about 2-2.5bar for spraying.

For applying another as long as it aint silly cold you can go straight on with another coat, if you leave it too long and it get too tachy then the next coat wont flow properly!!!!!!

As said make sure its clean and wetting the floor keeps the dust down, and you want it ambient temperature. If ur baking it u want a metal temp of 60 degrees (useless info but i had a question on it )