Home network using Mac + aircard+ pc

LOL. I have a Macbook. I have a Sprint Aircard. My Roomate has PC. I need to broadcast my signal from the aircard to a PC. I have a belkin router. I am lost as to how to do this on a MAC. We'd used the aircard connection as a network hub between two PCs but not the first clue as to how to do this with a mac in the loop. ANY help will be met with large gratitude.....
the bottom line is that I need to take my signal from the aircard that will only work on the mac, transmit it to the belkin, and have the PC pick up on it wirelessly via the belkin.
Dear God, if there is an easier way by all means tell me.