If you have questions about handling a legal matter, please contact a lawyer.

The most simple procedure is for an uncontested divorce. This is where you and your spouse can reach an agreement about the division of your property, and, if you have any children, what arrangements will be made for them.
You begin the divorce procedure by preparing a document called a Petition for Dissolution of Marriage, along with various other supporting documents. For an uncontested divorce, one of these documents will be a marital settlement agreement outlining the division of assets (and your agreement regarding any children). These documents are filed with the court, and copies of them are provided to your spouse. You will attend a court hearing, at which time the judge will make sure that all of your paperwork is in order, perhaps ask you a few questions, and enter your Final Dissolution of Marriage Decree.

The State of Indiana has gathered resources to assist you at https://www.in.gov/judiciary/selfservice/2486.htm