don't type ./quake2 iun the console, just type quake2
and it's not starting because you don't have sound drivers
and compiling from source is quite easy, you just do
1. download it (obviously)
2. extract it
tar -zxvf <packagename>.tar.gz
or
tar -jxvf <packagename>.tar.bz2
3. go to where you extracted it
cd <packagename>
4. configure it
./configure
5. the actual compiling
make
6. get root permissions (otherwise you can't copy the files to the install directories)
su
<root password>
7. install it
make install
easy as long as you have everything you need to compile it, drivers are sometimes a bit harder, but for most things that's it
and as for 9.2, the website is a little confusing, but there is a list of servers that you can download from
here.
i think that would be your best bet, and it should be a painless process since you're using mandrake 8.2 atm.
but as always, you should back up anything you want to keep
by the way, what soundcard is that?