Ok, there’s a bunch of them here, copied from customtf.com, and I should try to consolidate them into one, but they really do seem to be about different issues. Complete newbies should actually read the original CustomTF faq.

In terms of installing the game on your comp, there are a number of quakeworld clients you can use, try ZelTF.

Once you install it, you can connect to the agr server (tastyspleen.net:26666) and let the AGR files download, OR you can try this torrent (credit Sapphired).