4yr old appointed lawyer what happens next will I get visitation as the father

Unless there is an order of protection in place barring you from seeing your children, you should have access to them. I would need  more information- is the divorce final, is there a custody/visitation order in place, etc. If there is an existing order you can bring an action for contempt if the lack of visitation is due to violation of the order. As far as the law guardian, they are often appointed by the court in highly contentious cases to represent the interests of the children. Your son will be interviewed separately by the law guardian (his lawyer) and the law guardian will make recommendations to the judge regarding visitation and custody.