1) If you are able to buy a mouse, buy one, and learn to mouse turn.
2) Key bind all your abilities or as many as you can handle. You can start slowly and work your way up. (there are some people who do not key bind and are successful, rato anyone? however learning to key bind and mouse turn will dramatically improve you gameplay. btw rato got to 2160 in 2 with like no keybindings lawl)
3) Pick up some add-ons from curse client. Get Gladius and Battleground Targets to start.
4) Learn to use macros and focus macros. Here are a few examples of macros i use on my ret paladin:
Focus Repentance: this macro uses repentance on my focus target in arena(usually the healer).
/cast [target=focus] Repentance
Hand of Freedom Party 1: this macro gives the first person in my party freedom. you can also put your partner's name in place of "party 1." i prefer using specific names.
#showtooltip Hand of Freedom
/cast [target=party 1] Hand of Freedom or /cast [target=Gambino] Hand of Freedom
Now those are only 2 examples of the macros I use on my ret paladin. You can apply the same basic format to all crowd control and support abilties (fear, hand of protection, master's call, etc.). Please post anyone questions you have about your own classes or whisper me in game at Rék.