Mike Seeger plays a lot of different types of Old Time playing methods, both up and down picking - If I were you, I'd concentrate on one style that you like till you've got your head around it, before you start looking at other styles. I started on Clawhammer (aka frailing, downpicking, rapping etc) many years ago, and haven't yet got round to looking very hard at the other styles.
I've bought many banjo instruction books over the years. If clawhammer suits you, a good book to start with is Clawhammer Style Banjo by Ken Perlman, who explains it all in detail, leaving very little to chance. If you work your way to the end (could be at least five years if you do it properly!) you'll be a very good player indeed.
Ray