For what it's worth, I don't really care if you wrestle with your uncle, brother or whoever. If you enjoy that, go for it. Just don't expect it to help you become the next bantamweight champion of the UFC. You asked for an opinion. The question you asked is, "What else do I need to do?"
In my opinion, if you really want to be an MMA superstar, you need to start with a strong foundation. And you just don't get more bang for the buck than a quality high school wrestling program. You'll learn solid takedowns, takedown defense, and very good body awareness on the mat. You will also get into really good shape, push yourself beyond what you thought your limits were, and develop a really strong core. And it's CHEAP! It's through your school, so even if there's a fee, it will be incidental.
In the off season, if money's an issue, Judo will also serve you well and is often taught as part of a non-profit... meaning it is usually pretty inexpensive. If money's not an issue, find a good MMA school and learn some technique. Train with other people who ALSO want to be MMA fighters. Iron sharpens iron.
Ultimately, I don't have any idea who you are. You might be a 45 year old troll. Only you know. All I know is, you asked a simple question, and we're giving you simple answers. What you do with it is completely up to you.