I'm planning to run a game of Microscope for the first time with players who've never played it before as well (hello deep end!) and it's going to have to be online as my players of choice are scattered across the country.
I'm planning on using skype and google docs plus possibly a chat interface to make clarifications/spellings for names.
But, since I have no experience with Microscope and it's unlike any game concept I've tried before (Baron Münchhausen is probably the closest thing I've played before) I'm planning on doing some briefs to help with some small examples; but what else can I provide my players to ensure that they are:
a) Enthused b) Clear on the rules c) Prepared