I am currently free more or less whenever, other than Sundays from 5 PM on EST. This may change if I get a job.
I also have Skype or Vent but if we use Vent someone's going to need to talk me through turning off having to push to talk because dear god that threw me off the few times I tried it.
Edit: Also, I basically play everything ever. I can run top, mid, jungle, support, or even ADC but I'd need to practice that last one a bit more. And I have at least two or three options for each role that I know well, and even more that I can play acceptably.