first off spend some time getting to know and memorizing the traditional meanings of the cards, as well as your own personal meanings for them. also spend time learning what the elemental dignities of the cards are, the geneder of them and about the technical things like significators and reversals. while you may not use some of the technichal things, it is always good to understand what they are.
secondly you need to learn a couple different spreads. again, while you may not use them in every day readings, i find that they are good tools to learn how to apply situations and specific questions to cards.