Welcome to the baseball side of the Cafe.
Well, you should try and learn as much as possible about baseball in order to be competitive. There is lots of free fantasy content online, Yahoo and ESPN have stuff daily and would probably be a good start for you. As far a rankings go, not one is perfect. Over in the Baseball Leftovers forum is a thread that has compiled the Average Draft Positions (ADP) from various sites...you could roll with that as a ranking if you wanted.
And of course visit this Cafe frequently, the Draft/Trade/Keeper, & Baseball Leftovers would be good forums for you to at least lurk in.
Good luck, and have fun. viewtopic.php?t=364592