Compared with Borg, Don and Tojo, I know nothing, relatively speaking.
But as another newbie here who also only recently returned to the hobby, wanted to chime in and mention that I also had a decades old compressor from the old days. I went out and bought a new one. Now think I would have had just as good a starting point had I gone out and bought a regulator, or better a regulator/moisture trap combo as mentioned by all three of the more experienced modelers above.
Welcome, btw.