Be ready to post every 24 hours. This doesn't mean you have to interject with nonsense just to keep up posting every day (though a quick post to describe your character's demeanor, reaction to the last action, or something of the like is always welcome). The main thing is to ensure that no one is waiting more than 24 hours for your action. If you take longer and we are in combat,
If you take longer and we are in combat, I will delay your turn, or post an action for your character if I feel the party is in danger and you can do much to help.
Even if you feel current interaction should be addressed by other character, post stating so, provide that feedback. You can express the internal feeling of your character and by doing so, let everybody know a bit more about your character, how do you see current events, and that you are following them.
You can expect me to post at least every 24h too. Currently I am posting more often, but I do not want to promise to keep it up forever. Since I am just beginning as a GM I also reserve myself the right to put things a few days on hiatus to have time to fully process the resukt onf an encounter and set up my preparations for the next few, but I will give you fair warning of this and you are invited to roleplay during this time.