rfpic
A lot depends on the transmitter/receiver you are using. If they are inexpensive modules like the laipac TLP modules, you will have to do more than just hook up serial I/O. You will have to do some sort of encoding (google for manchester coding).
However, I would first get this running by connecting the serial output of the sender (after the rs232 driver) directly to the serial input of the receiver (i.e., take the transmitter and receiver out of the set up initially). Once you have it working, you can add the Tx/Rx pair back in. it will be much easier to debug this way.
Finally, Rookie wasn't being rude, just honest. the less detail there is, the harder it will be for some one to help silvio.