Jason, here are the basic steps so you can research deeper into each step.
Asuming you are just using standard 2 pak paints and not candi or HOK paint.
1) If your going down to bare metal, scratch the bare tins with P80 grit.
2) Etch prime your tins, some people don't etch prime most do. Your choice.
3) Primer/filler coats, I use 3 coats of this high build primer.
4) Apply light guide coat over the primer with a matt black or similar paint,
5) Rub down guide coat to reveal the primer. When guide coat has been sanded off with no traces left then aply wax & grease remover, dust over with tac rag.
6) Apply the base colour you have chosen. 1st light coat semi dry, then 2 wet coats.
7) Apply an intercoat of clear over your base coat, 2 coats Max.
8) Sand down the shine of the intercoat so you have a matt finish.
9) Layout your flame design with a 1/8th tape. then mask over the top of the flame layout tape and entire tank or fender using either a frisket film or a transfer tape.
10) cutout the flames layout over the top of the 1/8th tape using an exacto knife with a sharp new blade or use a new razor blade to do this. careful not to cut into your base coat. DONT PRESS HARD WITH THE BLADE.
11) remove frisket film or transferr tape where you have cut out to reveal your flames design.
12) Spray your flames colour/s over the tank and fenders.
13) after paint has dried, remove rest of transfer tape and 1/8th tape.
14) knock down edges of flames if any with wet p1500 grit.
15) remove any bleed throughs also with this paper. intercoat of clear protects your paintwork so rub carefully not to go through the clear.
16) Clearcoat the whole job over with a further good 3 or 4 wet coats of clear.
17) colour sand then use rubbing compound and buff clearcoat to a high polish.
18) use a hand glaze to finish or a machine polish, dont use regular polish for at least 3 months until the clearcoat has fully cured.
These are the basic steps you will take, as far as paint goes follow the manufacturers guide lines for flash times between coats and drying times before clearcoating. As far a tip sizes go, once again depends on your gun, but a general guide will be, primer tip size, 1.8 to 2.2. the base coat between 1.2 and 1.3. clear coat 1.3 to 1.4.
Best to have 3 guns, one for primer, then one for base coat and one for clearcoat, keep these guns for these uses only and dont intermix them for best results.
Hope this is all you need and good luck with it.!!