What you need for Karazhan

1. So first, everyone who are willed to raid should check:
www.bosskillers.com for boss tactics. You could ask officers what bosses we are going to do, and it ain't be bad at all to read the other boss tactics too.

2. Everyone should have these addons:
KLH Threat Meter : Downloadable here http://wow.curse.com/downloads/details/4204/

Some addon customing your raid UI, for example CT raid assist : Downloadable here http://wow.curse.com/downloads/details/491/

Deadly Boss Mods : Downloadable here http://wow.curse.com/downloads/details/4940/

3. Then, try to bring your own Flaskes and Potions you need for each day raid. Remember to bring your reageants too, for example Mages remember to bring Arcane Powders and in case you don't have the food table spell, stack loads of food and water with ya.

4. Everyone get some money so you can repair. You all have to expect for wipes. Easy way to get a little money is to do some dailys or grind some primals.

5. If you do happen to have some PvE gear, grab them so you won't be jumping in raids with your resilence gear.

This should be a little something! Happy raidings everyone!

Thanks Xelaron,Nice Post there :-)

Xelaron made some good Points

If all got an idea on what to do on Bosses that will make Raids go way faster.
If all got KTM then DPSers will be able to control their aggro and avoid some possible wipes.
Flask/Pots Can't stress how Helpful these are,makes everyone happy.
And Ofc PvE Gear,try getting some & even if you can't,At least don't hope to Replace your Green Cloth Chest to an Epic Plate One when you're a tank (That goes to every Class).