Cash and tournaments are quite different beasts... In a cash table the blinds are static and usually no antes so other than leaking away blinds the pressure to play a hand is not as great as a tournament where eventually with the rising blinds and antes you are pressurized into playing hands.
On cash tables if you win a hand you are instantly rewarded and your bankroll increases !
In tournaments you can win many many hands and finish with zilch, because you lost a big one !
ShoTyme's suggestion is a great one...
In tournaments there are so many variations also that you will favour some over others