Web conferencing plugins (including BigBlueButton)

I'm looking for a page or thread that has some information on BBB best practices. For example, is it better to have a BBB activity in every lesson where you plan to use it or just one at the top of the course page in the General Section? In using the breakout groups is there a certain number we should limit ourselves to based on our server specs? It would also be nice to have any other tips from people who have used the plugin more and under different conditions.