Nice mill. Did you get a manual?
This page has some scans if not.
http://gorton-machine.org/machines/manuals.html
That mill used Brown and Sharp #9 (B & S #9) tooliong. Not as common as R-8. You'll want a fractional set of collets. A few weldon shank holders in common sizes that you use (3/8", 1/2", etc). And a drill chuck. You may start watching ebay. Sanddrag's list is fairly complete to get you started.
Mobil Vactra #2 is easy to source in gallons and is a good recommendation. If you can source some Mobil Vacuoline 1409 it is better on manual machines. Mobil removed the tackifiers from Vactra #2 to improve coolant separation on cnc machines. The Vacuoline 1409 sticks to the ways like is should. I order it in 5 gallon buckets.