In your thread, so long as you obey guild rules (which are simple), you are god. Make sure your players know that.

An alternative to kicking a misbehaving player is to kill and/or maim their character. Most folks are decent. There are a few who would repeatedly break the same rules and not learn from it, but most are better.

We've personally found that being strict when approving character sheets avoids all sorts of issues later on. We make sure PCs fit a fairly extensive set of parameters before being approved so that we don't have to watch quite so closely over the IC. And we make sure the players help with the watching and plotting.