You should check with Genesee County Friend of the Court to see if they have a form you can use if you intend to represent yourself. However, I would not recommend that you proceed on this type of a motion without an attorney.
Have you spoken with your ex to see if he will voluntarily allow the move? If he's willing to do so, and the two of you can agree on a parenting time schedule and transportation concerns, you'd only need an attorney to draft the agreement . . . meaning minimal costs.
Candidly, you should engage an experienced family law attorney for representation in this case, as the distance and other facts you set forth do not guarantee that you'll will be successful, especially with a very involved parent. The fact that you plan on being married does not mean that you will, in fact, marry. The large extended family is really irrelevant. This is a very important matter and so much has been recently addressed in cases reported. Do yourself a favor and hire an attorney. If money is an issue, have your "intended" pay the family lawyer for services to be rendered.
Neil M. Colman
Mr. Colman is licensed to practice law in Michigan. The response herein is not legal advice and does not create an attorney/client relationship. The response is in the form of legal education and is intended to provide general information about the matter within the question. Oftentimes the question does not include significant and important facts and timelines that, if known, could significantly change the reply and make it unsuitable. Mr. Colman strongly advises the questioner to confer with an attorney in your state in order to ensure proper advice is received.