If this is new to you it can get frustrating pretty quick. If you can find an antique car club in your area, you would be wise to find a body guy that would like to teach.... If you were closer I would welcome you to come by my shop for a few hours for some pointers.
It does take a lot of patience and looking at your mistakes to learn from them!
I suggest this process
-Bare metal
-Rust repair/metal work
-DP Epoxy primer
-All body work
-Evercoat Slick Sand ( cheaper than K38. A sprayable body filler almost)
-Block with 80 touch up body work
-PPG K38 Block with 220 dry fill minor imperfections
-PPG K38 Block with 320 wet
-Wet sand with 500
-DP Epoxy reduced with DT870
-PPG DBC base coat
-PPG 2002 clear with DFX11 hardner and reduced with DT 885
See the photo's in the links below.