yeah Johng- fair comment- Having considered what I posted a bit more, to be fair Poker can be richer than chess- in that personality is much more important,
but poker cannot offer anything equivalent to an endgame study or I dont know of any description of a poker tournament to compare to Zurich53 by Bronstein or fischer's My 60 Memorable games.
Anyway to go back to the original posters question a good basic tactics book or software would improve his results fastest- the chess master software has lots of tutorals built in or go to
www.chessbase.com