I would be happy to start contributing to the voice thread as I can.
And scheduled times for conversation sound good. I am agnostic about Skype vs. Google+, and am willing to use any software. That said, I like Google+ because it makes it easy for groups of people to talk with each other.
It would be easy for me to start a Hangout every evening, and other people could see it and join through my Google+ status (I think).
But I'm willing to use whatever software is easiest for you.
Once a month sounds great. Weekends or evenings work for me (I'm in the California Bay Area, so on PST time).
I'm not sure how best to do this, but feel free to send me an email at firstname.lastname@example.org
, and I can add you to my "Greek Conversation" Google+ circle, and automatically send out a notification when I'm online for a Greek conversation. If Skype works better for you, we can add each other as contacts.