When you get ready to buy your paint you will want to use there "system" which will tell you what types of material you need to use. Using an epoxy primer is not really nessessary if you plan on color coating fairly quickly and have a dry spot to keep the car. If this is a project over several months the the epoxy primer is what you will want. I have a hood that has been stored "outside" for 3 years covered in epoxy primer that is still in good shape.

The only reason that you need a sealer will be if the "substrate" is weak. Basically if you rub your hand over the existing paint and you have stuff on your hand. Your sealing the "substrate" so it doesn't bleed through.

95% of the paint job is prep. Filling, straighting, leveling "SANDING" is where the work is. Paint will not fill dents or scratches.

Using a highbuild primer over the whole car then "blocking" it out will give you the best look. 320 to 400 grit for your final sand prior to color will leave enough bite in the primer to allow the paint to stick.

Wipe down your car with a "silcone remover" and 6 to 10 clean rags, only wipe a 1/4 panal at a time, wiping with a wet towel and drying with your other hand. The idea is to "remove" the oils and silicone from the surface. Use rubber gloves since skin oils will mess up paint also.
Use a "tack" cloth prior to painting, do not try to blow it off with an air hose, all your doing if you do that is putting the dust in the air.

Mask everthing your not going to paint. This keeps "paint" out and "dust" in. For example if you are not intending to paint the area behind the grill mask it off "dust" will hide in there.

Paint door jams, under hoods, and hood seams a day early then shoot the rest of the car the next day.

If something gets in the paint while spraying, leave it there until it drys. It a lot easier to fix when its dry.

Ther are 100's more thing to think about.