I expect daily posts. At least one a day during the week. I usually have a little more availability on the weekends but I understand not everyone does so posting on the weekends is optional, but encouraged. The more we keep this train rolling, the sooner we get to the station.
Posts should be descriptive or communicative. One liners should be kept to a minimum. I expect a little bit more and the more you put into this, the more enjoyable it will be for everyone. Out of character posts should be made in the Discussion field unless they are specific to the post being made in. For example, if you need to clarify your action in a combat round, include it in the post. If you’re asking to take a feat next level, that should be in the Discussion field.
If you’re going to be unavailable or away for a period of time, it’s best to communicate that in advance where feasible. Of course real life throws us curves, and I’m not immune, but communication is key in PBP more so than any other environment.