eBay purchased legacy printer - Troubleshooting help

I purchased a legacy HP 4M+ to tem****arily replace my old Apple
LaserWriter. Ok. Its old and I don't have a manual (HP doesn't have the
user manual online anymore :( I needed a quick replacement and couldn't
afford a new laser printer. I probably should have held out for a newer
model, but I was in a hurry. The printer prints text, browsers, and
email fine.

It chokes on Adobe Illustrator. I searched groups and found out  down
rezing from 600 to 300 dpi will help. It eliminated some errors, but
I'm still having trouble with the fonts. Will someone explain the deal
with downloading fonts to the 4M Plus? If I change fonts frequently,
what do I need to do to keep postscript printing? Can I convert the PS
output w/o creating a PDF? The 4M Plus has another language called
PCL-- what is this?

I know its a lot of questions. If you print from a postscript
application you'll likely have the real questions that I need to be
asking. ehehe.

NB

PS. I x-posted with the comp.sys.hp.periperals. None of those guys are
gonna read a mac group anyway. ehehe