Here's some resources for you regarding beginner and intermediate material that is not only well taught, but also more than good enough to perform professionally - I know, because I do.
Greg Wilson's "Double Take" (Card Stunts and Pyrotechnic Pasteboards are more challenging but not too bad either)
John Guastaferro's "Brainstorm" DVDs - really, really good card magic.
Royal Road and Card College are excellent books teaching sleights and tricks.
As far the the trilogy goes, I've never worked through it, the material just doesn't appeal that much to me - lots of flash btu not much substance in many cases.
Cheers,
David.