plz help on pic 18f4550

hi to all
i wanna interfacing circuits wid keypad n lcd using pic 18f4550 even for usb. some sample programs for this

For USB:
https://www.electro-tech-online.com/custompdfs/2007/02/51526a.pdf
As for LCD and keypad, you should be able to easily adapt code from other PICs for use on the 18f4550 such as the 16F628 tutorials featured on Nigels site:
http://www.winpicprog.co.uk