Developing boundaries

Where did you start with placing boundaries?

So far, I’ve stopped doing his laundry. (He does no house chores whatsoever.)  I don’t clean his part of the bedroom.  And he is getting more and more unkind when he speaks, so I’m going to start walking away or taking the kids to the park or something when he’s rude.

But that’s all I’ve got. Where did you start?  What boundaries made a huge difference?  (My goal is not to copy other people’s dynamics, so much as try to see places where I haven’t seen that a boundary would be helpful. Or maybe it would spur something in my mind that helps me see my situation differently.)