I learned fingerstyle from my guitar teacher. He taught me a modified classical style using the thumb and three fingers. What this means is I could play fingerstyle songs, but I really couldn't do any Travis picking. At Mapletrees suggestion I bought Mark Hanson's The Art of Contemporary Travis Picking. This is a great book to learn Travis picking.
Pay attention to Mr. Mapletrees. He won't steer you wrong. He might confuse the He!! out of you with some of his posts, but he won't steer you wrong.
David