Kara is fun! I honestly found it way more enjoyable than anything in T5 content (TK/SSC are BORE FESTS).
Some of the badges gear is really sexy but it only works once you've hit the 490 cap. The chest is probably the best item you can get first with massive armor, health, and defense. The sso shield is a tad better than the nightbane one so you're off to a good start.
The only "tip" I have is check out a site like wotlk.wowhead.com and see if any gear you have or are considering purchasing is having its defense value reduced. A lot are and this is important because warriors/pallys are losing 20 defense from talents and a good bunch of defense on gear has now "become" strength (as well as other stats adjusted or removed, etc.)
Former healbot now a Disgruntled protection warrior.