Yes, he can file paperwork on his own. I'm not sure how it is in other counties, but in Dane County all the paperwork is online at http://www.co.dane.wi.us/clrkcort/court_forms_family.htm
File the paperwork and have her served with the petition and summons (you can do it in person or have a sheriff do it). Then you will need to either fill out a Marital Settlement Agreement or request a pre-trial conference. The Marital Settlement Agreement basically lays out things like division of assets/debt and whatnot. If she isn't willing to agree, all you have to do is write to the court, say you can't come to a consensus, and request a pre-trial conference. After this, the ball is rolling and the judge will issue a trial date.