Icy Veins is a good place to start - I also like tankspot, but maybe beacuse i'm nostalgic.
Make sure you know which LFR the guild is doing - the first 2 stages of LFR (the first and second half of Mogushan Vaults) require ilvl 460. The one the guild currently runs on wednesday nights is the next bit of LFR to open up - Heart of Fear which requires ilvl 470 AND the first 2 bits of LFR to have been completed.
LFR is good to help you gear up, but doesnt really help in terms of boss mechanics, so don't worry too much if you dont manage to learn anythign - I dont think Goffik has done LFR yet and he's main tanked 4 bosses for us
As for a raid spot, i'm pencilling you in for next thursday - I'll have a chat with Aphaeas if she wants a piece of you too, and we'll work something out