I'd put the belt on and see what happens (in the driveway).

The compressor pulley may have a bad bearing (make a lot of noise - shut off engine).
Compressor may be siezed, belt will make a lot of noise - shut off engine.

Compressor may not engage at all - different problem, leave belt on.

If you get this far, you have a belt on and a seemingly good bearing so you can move onto checking if the system is charged and deciding how to get the cold coming out.

If you are super lucky - the system is all charged up.
If you are just lucky, the system is only low and needs a charge.

Anything else and I would think flush, replace drier and maybe expansion valve, maybe even compressor, charge properly and enjoy.
This last part could cost up to $500 if you do most of it yourself.

Well worth it.

__________________
80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250