the 12f675 is a small pic, any reason to use such a limited pic, especially since you're just starting out?
you need a soft-uart to 'decode' the serial signal. rs232 implies a certain signaling level (voltages and such), your wireless link is not rs232, it's just regular asynchronous serial ... if you were to connect it to a max232, you'd have rs232, or a different chip you'd have rs485, etc.
alternately if you used a more robust pic, such as the 16F88 (a good choice for beginners), the chip contains a UART built in, then all you need to do is read bytes from the receive buffer, and load bytes into the transmit buffer.