Not played it online (or any game online for many years).
How does the whole server thing work?
OK, found this:
https://support.steampowered.com/kb_article.php?ref=5452-TASB-6078
The choices appear to be: join an existing public server (of which there seem to be plenty), or one of us host?
EDITED: 19 Feb 2016 16:05 by DSMITHHFX