So I'm returning after a BUNCH of RL crap, and I see that my guild still exists (with me as the sole member).

But I cannot remember how to get into my guild room! or my home! I've gone into the doors that let you pick an exit, but neither my guild room or home are options.

Please help?

You can get there either by the short cut menu or if you go to the teleporter that changes blocks you can got o your alliance room at the very top option.

On keyboard press F9. Then you can go from there.