buying a short sale with a active contract and questions about a 203k loan.

I am currently looking at a home, it is a short sale and will only be approved by a 203k loan or cash. I just have questions regarding the 203k loan and how it would work? i have no idea what i am doing and that's why I'm asking you guys. I have a little idea of how buing a SS would work but i don't know how the 203k loan would work. please help. me currently at the moment.