Do I need to sand this whole thing down!

so seeing i decided to scuff and squirt the rest of the body of the car (what is doable).
I wanna use the self etching primer?

Heres what Iv'e got so far.

1) for what is already sanded to bare metal, dent work if necessary, epoxy primer, body filler, sand, then apply 2k primer.
2) for the rest of the car, scuff the paint, then skip the epoxy since there will be no bare metal, and then apply 2k primer.

After car has been primed, sand 1 more time, then apply base coat?

I actually thought about doing the car glossy black, but I keep thinking that it will maybe be to hard to do for a first timer. So if its a little more forgiving, then I would like to do a glossy dark red, and then a flat black hood.

if im on the right track I checked out SPI for there epoxy and 2k, but i didnt know what would be the next step as to achieve my desired goals.