A tutorial for the analog settings would be great, but this should help some
http://www.picbasic.co.uk/forum/showthread.php?t=561
and here is a way to use the ADC that is a little different than the manual, I still prefer this method.
http://rentron.com/PICX2.htm
Read through the above example, when you understand how it works it should really help you understand the inner workings.
Post your questions.