Hi Scotty
The sockets for the fan connectors usually have three pins and are white in colour. They can be located in various places depending upon where the manufacturer thinks about putting them (constraints of layout).
There will be one close to the CPU with another close by usually. A third can usually be found near to the AGP port (the brown socket that the graphics card sits in)
If there are no spare sockets, then an adapter can be bought that connects into a power plug (the 4 pin plug that connects to Hard Drives, CD or DVDs etc) this will have an extra set of leads that terminate in a fan plug
Hope this helps