What server does JSP play on? Does it matter? Tips for beginners? I am reading up on the wiki now.

There is no real server jsp users play on. We are kind of spread out. It doesn't really matter imo. Just play on a server that induces less lag for you.

This sticky is a bit old, but it still contains useful info:

http://forums.d2jsp.org/topic.php?t=61995986&f=174

I would suggest unlocking most of the classes first, and see which char tickles your fancy. Wizzy/Priest/Necro are pretty newer player friendly classes. If you have any questions, feel free to pm me.

i usually play on "best server" which for myself us USNorthwest.
Obviously you can check out the realmeye wiki http://www.realmeye.com/wiki/realm-of-the-mad-god, or for some more straightforward guideline pages check http://bluenosersguide.weebly.com/

Best of luck!