How do I know what video and sound card I can use on my computer?

I got a second-hand computer. It has no sound card and video card. So I need to get one (mostly from eBay). As I know that different computers need different (pins) of rams. I wonder if similar thing could happen regarding video and sound cards? Like do I have to figure out how many pins, etc when I choose my video and sound cards? Thanks for helping.
by the way, my computer is like 2 or 3 years old. and i will be getting only some ok video and sound card, as i am not a hardcore gamer (just need to get one that can run most games).
ok. forgot to mention, i am not so familiar with computer. so better answer in details.

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