Karazan Guide from Wowwiki - Bookmark and read for bosses

http://www.wowwiki.com/Karazhan

This link is great as it has links to strategy for all the bosses and has great maps as well.

For all of group2 and all those keyed for Kara wishing to partipate:

Knowledge is Key
You should be familar with the stratagies detailed on vairous websites,
videos, etc, before grouping.

Heroics and Upgrading your gear
You should have at least 1 heroic key and have run heroics for additional gear for your class. You can use the Armory at www.worldofwarcraft.com and look up your charactor, see what UPGRADES are vailable for items you currently have and where to get them. Upgrading should be a non-stop goal. Kara is not a main source for gear upgrades. Heroic instances are.

Gear
You should have 0 green items and no under 70 pieces!

Health
Your charactor health should be optimized as much as possible.
Feed, pots, new gear for stam, etc.

You should come prepared!
Don't show up to Kara, asking for food, water, pots, ammo, regents, etc.
You will not be able to find mana or health pots at AH shortly before regular realm Kara time! Buy your needed items early!

Mods!
Use them!

#1 Deadly Boss Mod
This addon will give you detailed info on the effects, spells, alerts, time durations, etc that a certain boss will be performing next. If you know what is going to happen next, you can be fully prepare for when it happens.

#2 KTM Threat Meter
This addon will show a list of who is causing aggro to the mob/boss at the current fight. The main tank should always be on top. If you are causing more threat than the tank, the mob will come to you and you die. (and most likely the group)

There are tons more adds for your class. Study them, install them, get use to using them.

Ask for info:
Ask a higher lvl same class as you for ideas to improve your charactor.