Rebuild Questions

[85/Silverado]

I got this 85 silverado from the original owner a few months ago, It has a new 350/350HP motor with 20k miles on it. The body is free of rust and dents. Never been repainted so I need to have that done.

Should I sand it all down myself? If so how much would I save?

Both bumpers have to be replaced since they been bumped and twisted a little, do you think they can be repaired?
I need to replace all the door rubber and the drivers vent window since I tried to open it a few days ago and the bottom mount snapped off. Someone said it was hard to repair. So I don't know If I should just get a new door.

What other year doors will fit on the 85 Chevy?

All the gauges work like new, The clock keeps better time than my watch.
I got the truck for $3000.oo,, not sure If I paid too much but we need a truck to carry stuff from the big city 35 miles.

Thanks For Having Me.