You play using ezquake.exe, launch it and enter the server url into the multiplayer console. Then hit join button. Once on the server go though your player setup stage and setup movement keys etc. Then join game, once in game u can use the console to add bots to practice against. Just type addbot
Give it ago ezquake is good, a lot brighter than regular quake 1 and the server does not lag like quake 1 does, being a Quakeworld setup. If anybody needs any files just let me know I have them all just need a bit of time to upload and link them here on the forum.
During the install u will be asked do u want installer to find pak0.pk hit no once complete add pak0.pk to your nquake id1 folder. You can get pak0.pk here