As everything have been covered in many thread here... appart from reading, trying&debugging session, i don't see what i could suggest.

Try something small first, the usual, send Someting to your PC, then from your PC to your PIC. Once done, you will know how to do your stuff, at least some basics of.

Sure Microchip have some C-18 Usart, serial communication, WriteUsart,putcUSART, usart.h..., code example/template somewhere on their website or forum.

I'm still open to business offer... links bellow