Deb, have you gotten started with this project (the one pictured in the OP)?
Mechanical issues and other major-damage attention will be the most basic things, of course. But I notice you have a lot of exterior rust (on those doors, etc). You can use a light "sandblasting" technique (which is the usual professional way) or go over the surfaces with an electric reciprocating sander, medium-grit aluminum oxide type so it won't tend to clog with rust and old paint right away (but no heavier than a #80 grit... experiment). If you use the sanding method, I'd finish off with something like a #100 or #120 (finer) grit paper.
The rust will have left the metal with tiny pits, and even the sandblasting or sanding won't really rectify that. If you brush paint it, the paint will be thick enough to fill the surface pretty well - or at least you won't notice the pits through the brush marks! But if you want a smooth surface before repainting with spray paint, you can apply a thin autobody surface filler like Putty Coat or Evercoat 870 (two brand-name products).