[The Fifth Horseman]

i dont even know what soundcard i have on the computer. anybody knows how i could make the sound work?

To begin with, you'll need DOS drivers for that soundcard. And, of course, identification of what exact soundcard is that. There's a program called "EVEREST" (google for "Everest Home") that's pretty good at identifying older components.

when i've tried to make it work it tells me i dont have enough memory and to delete non essential TSRs, what are those?

Reboot into DOS mode and run from there.

The memory issue most likely refers to Expanded/Extended memory (DOS-specific ways of handling larger amounts of RAM - for a given value of "larger").
TSR = Terminate and Stay Resident = a very limited form of multi-tasking used in DOS.