for those of you that dont know, i have some car restoration issues. heres something to refresh everyone's memory:




ok so im in the process of returning my car to stock and i went out and bought a bunch of preparation supplies. there are some heavy spots of body filler that im going to have to sand down, and the top coat of blue paint is thick high quality 1 to 1 mixture. then there is the original coat, and the yellow coat from the previous owner. so as you can see in the second pic i have a lot of sanding to do. so i have a million questions.. any help would be appreciated.

so far i have a
corner sander
orbital palm sander
sanding block
40, 80, 100, 150, and 220 grit sand paper

what is the best plan of action for preparation?
is there 2 heavy a grit sand paper to use?
i know sanding down to bare metal is not the way to go, but how far down should i sand?

any tips would be much appreciated