hi ilikestuf!! the easier way to find out if your motherboard have a sound card on board, is to check on it's box specs, or in the manual of the board. if you don't have the box or the manual, try to open the case and look for a brand name or a model on the motherboard... so you can search for it's specifications.
if there is a sound card on board, then you need to find the chipset type from the specifications of the motherboard to find the correct drivers for the sound card. we prefer to visit first the web page of the manufacture for info or drivers. if you don't have results, then search in alternative web sites.
if there is no sound card on board, then simply install a new one on a pci slot of the motherboard. new soundcards come together with a manual, drivers, and installation guide. if you have a second hand sound card, find the drivers for that, by brand name and model and install it on a pci slot on your motherboard and then put the drivers. have a good work!! reply again if you face problems.