My guild currently does Kara, Gruuls, Mag that I can go to with my gear and ZA/TK that I can join when my gears improved. I have about 22 Badges ATM and will probably start farming them alot faster soon.
I'm looking to be able to MT If I need to but also be able to do decent Arms DPS when another MT is present.
I can't see your defensive numbers, but you're probably okay to tank most of Kara, especially if the rest of the raid is pretty geared up. Try to talk them into passing you some tank drops.
If you're Aldor, go buy the Vindicator's Hauberk.
Some of the following depends on your luck with drops. When you get 35 badges together, I would buy Bracers of the Ancient Phalanx, they will last for a good long time. I would pick up Slikk's Cloak second. I had Cloak of Eternity myself and loved it. Devilshark dropped when I didnt' even need it, but I picked it up and use it sometimes for the SBV. Your weapon and shield are fine, either try to farm Sun Eater or hope Kings Defender drops (or both). There's no reason not to have Khorium Destroyer for the massive stamina it provides.
Keep any rings and trinkets you get from dungeons and raids at this point. Do some heroics and see if you get lucky on epic tank drops (belt from H Ramps, gloves from H Bot, boots from H BF, shoulders from H Sethekk).
Berg has a great gear ranking list on this site, take a look at that.
The short answer is yes, the long answer is: it depends.
I have both the +51 stam decks, I use the Vengeance one and the Auto-Blocker for farm content, Vengeance/Pocket Watch for new content. The stam is awesome, it was the reason I got it. I have been unsuccessful so far, but farm H MgT for the Commendation of Kael'thas to give you +57 stam and that situational dodge. THat will give you good stam and you can either use a different trinket situationally or use the Darkmoon deck for even more stam while you're gearing up.