Read the Threads at the top of the page in the Vogue UPGRADING forum. AKA "Sticky's" Just follow those instructions very carefully and you shouldn't have any problems. Pretty much any basic question you could have about that stuff is already answered in those threads.
My current personal keyboard choice is PCM Keyboard with the iPhone 'iclone' skin (just google it).
Download link for PCM Keyboard
http://www.pocketcm.com/keyboard.php
Have fun!