[@ImpLaughs] Free posts usually tend to be one liners and single paragraphs, but it's really more of a "post as much as you can/want" not really many standards to be met in free.

As for the posting order, I say it tends to vary with GM, and does sort of change with RP level. In my experience, Advnaced roleplays do follow a bit of order, where the GM posts first, and then all the players make their posts, all making one post, and once everybody has posted, the cycle resets basically, but sometimes the order and such can vary depending on RP and GM. I would assume that Free roleplays are usually a free for all, and with Casual, I can't say that it's much different from either. It just really depends, to be honest.