We spoke about this yesterday at the GDG conference about starting doing Android classes again.. couple of years ago i created a set of lessons that I couple revive, see the link.
I would probably do a mix of in-person workshops and mostly Google hangouts. There would be probably a minimum charge of $10 per class to make sure people are serious - to prepare a class takes couple of hours and to present it another one.
If you are interested please visit our g+ page and +1 the post, if I get enough of you to support it, I get seriously to it.
~ Uki D. Lucas