to answer your questions
1.Q) How many coats of paint should I use?
A) color coat is usually 3 coats but you can go more or less depending on color coverage, clear coat is 2-3 coats but you can do more but youwill be risking runs.
2.Q) When do you wet sand? It always seems that when I wet sand I take off all the paint that I just put on. I'm using 2000 grit. I know that the paint will have somewhat of a self leveling effect so sanding shouldn't be too much
A)sanding between coats is only nessesary if yo uhave a flaw in the COLOR COAT and like stated never on the last coat of color. and NEVER between clear coats (obviousely)
3.Q) How many coats of Clear Coat?
A) see Answer #1
4.Q) Do you buff in between the final coat of color and the first clear coat?
the best tip i can give so your panel has a smooth finish and doesnt look like a florida fruit stand is to not put to much matterial(clear) on at once a light misting will be good for the first coat (so it looks slightly rough) wait till it clear is not wet but a little bit "tacky" then apply the second coat a little heavier mist over laping 50% with every pass till it looks smooth. then let dry