I did a guide like this one time which was on my web host but lost it when i closed my web hosting account. So here it is, i actually find this information useful as a reference if I've deleted my Quake2 dir after a windows drive format or whatever. Also note there are many different clients to use for Quake2 this is the client i use and find works for me. Even if you use/prefer a different client try using this guide and build a r1q2 client and see if you like it. r1q2 is old school and i like it a lot, has never failed me. Cheers, enjoy.
Get and install/extract the r1q2 client files. - http://old.r1ch.net/stuff/r1q2/ Get r1gl as well and set to r1gl in q2 video menu (see r1q2 site for more info)
Optional customization: http://marlporo.pp.fi/aq2/ Installing pak files. rename customization .pak files in order. Eg woodensniperskin.pak you would rename after the next .pak file in numbered order from whatever .pak you have in /action/ dir.
Eg. If you already have pak0.pak in /action/ Get your woodensnipreskin.pak and rename it to pak1.pak to install it.
Setting up the game.
>edit your autoexec.cfg in /action/ (open it in notepad)
make a new config option rule set after the last line of code called //Modifications
Make/Add these alterations=
> name freewill-yourname
> bind r weapon
> set sensitivity 3
> set vid_ref "r1gl"
> set cl_async 1
> set vid_forcewidth "1920"
> set vid_forceheight "1080"
bind r weapon (controls/activates the sniper rifle zooming)
set sensitivity 3 (controls global mouse movement speed, adjust to your liking. You must change
it in autoexec.cfg with q2 closed then save it and re-enter q2 to apply the changes )
Adjust set vid_forcewidth/vid_forceheight to your monitors/windows desktop default resolution.
In Quake2 menu goto multiplayer>player setup and change allow download options to all enabled.
Create shortcut in /Quake 2/ for r1q2.exe and goto target options and add +connect 188.8.131.52:27970 after r1q2.exe This will allow you to one click aq2 and enter immortal frag server.
Any Questions, Comments, feel free. Will answer ASAP. I will further add this guide on aq2 gameplay/tactics, soonish when i get time.