You can apply with the Texas Attorney General for services to establish a support order -- even if you are still married. Their telephone number is 800-252-8014. Be sure and give them all the information they need to find him in Wisconsin. The Attorney General will work with Wisconsin or file here in Texas, whichever is appropriate. However, they only represent the State and not you. You should check with the law clinics at the law schools in Houston for low or no cost divorce help through their legal practice clinics. Good luck.
Please be advised the posting of this answer does not create an attorney-client relationship. Karen L. Marvel and the Law Office of Arthur G. Augustine, as a condition of their employment, require a signed written employment agreement prior to formally establishing an attorney-client relationship with any person.
A weekly guide with tips and legal advice for each stage of the process.