I would talk to a lawyer before you do anything. The laws differ from state to state, and what is a good idea in one state may be a bad idea in another state. And figure out how aggressive you want to be in the divorce and some of that will depend on how you think he will respond to finding out you want a divorce. A divorce that can be worked out without a lot of conflict is far better for everyone but if you think he is going make things rough on you, then you need to be a lot more proactive about protecting yourself. On the other hand if you feel that you can both be civil then look at less adversarial ways of handling your divorce. There are several options in WI for divorce, but I won't go into them because the laws in your state are going to be different.

And be careful of your actions, my wife has done some really dumb things that are going to come back and bite her.