PvP -> PvP, need gear suggestionsFollow

First off, my 70 Warlock as he currently is

I've spent most of my time on my warlock doing PvP, only instancing while leveling and only occasionally once I hit 70. But after a while it's really gotten a tad dull, and lucky me one of my friends is the friend of people who are currently in a raiding guild and are willing to take us in. It's a small guild, not enough people for 25 man content yet, but I still don't want to dissapoint them as a scrub.

So I was wondering how I should go about gearing from what I'm currently equipped with. I'm not sure where to look to find what pieces are good equipment to enter Karazhan as a warlock with, and am unsure of what of my current equipment to replace.

Note: My current spec isn't what I'm planning on raiding as, obviously, nor is it what I PvPed with, just something I was goofing around with. I think I have an idea as to what to spec, but if someone has any suggestions, feel free to pitch in.

I appreciate any help, and if there is already somewhere obvious I should have noticed a post like this, I appologize, I wasn't able to sleep very well tonight and am very tired.