What do I need to do if I have a warrent out for my arrest for non child support payments in Wisconsin?

You should check on the Wisconsin circuit court internet site (c-cap) to see who issued the warrant and why. Once you establish that, you can  consider making a significant payment towards the arrears, which may go a long way towards whether the court finds you in contempt and puts you in jail or let's you go free. If you are being criminally charged ,you should consider hiring a criminal  defense attorney to help you.