Congrats on the "new" machine. It looks like
this is the manual (PDF) for it. Also, that's a neat floor in that shop, especially if you drop something. You don't see too many like that anymore.
You'll want the following:
A 6" machine vise (Kurt ang-lock type are good)
Parallel set
Edgefinder
6" Dial caliper
some T-nuts (you may want to go for a whole generic stud, step block, and toe clamp set)
Some collets - check the spindle taper, it's probably either R8 or "40-taper", but could be a #30 or even a Brown & Sharp #9 or #10, or (hopefully not) but potentially even a proprietary Gorton taper. You really need to find out which it is.
HSS Endmill set (2 flute should do fine for aluminum)
A set of drill bits
Some taps in the common sizes you use (1/4-20, 10-32, etc)
A drill chuck with shank to match your spindle taper
Dial Test indicator and magnetic base
Boring head with shank to match your spindle taper and a couple boring bars
Fly cutter
Drawbar wrench / brass hammer.
That should have you pretty well covered to get started and make most things.
For all of these items except the vise, Chinese is fine. All of this kind of stuff is very decent quality from China these days. I recommend
Shars.com. They are discountmachine on ebay too.
Little Machine Shop is another decent source.
For metal surfaces, WD-40 works well for cleaning. For painted surfaces, use whatever cleaner is available, but test on a small spot to ensure it doesn't soften the paint. WD-40 with a maroon scotch brite pad can be great for removing both rust and old oil, but be very gentle with a light tough on the sliding way surfaces if they are rusted. You don't want to remove any metal whatsoever there. You can be a bit more aggressive on the table if needed.
After it's all cleaned up, you'll want Mobile Vactra No. 2 way oil for all the sliding surfaces.