You can find forms for orders of protection and workplace violence restraining orders, including the forms needed to modify or extend an order, on the Indiana Judicial Branch website. For the forms you will need to file for divorce, to modify a custody order, and more, you can go to the Indiana Legal Help website.
You can also check with the clerk of court at the courthouse in your area to find the forms you need.
A domestic violence organization in your area may also be able to provide you with the necessary forms or help you to fill them out. Go to Indiana Advocates and Shelters to find a local domestic violence program in your area.