You will find some of the forms for filing for a protection order here.
The clerk's office at the courthouse may also have the forms you need. (See CO Courthouse Locations) A local domestic violence organization or legal aid office may also be able to help you with the process. To find a shelter or an advocate at a local program, please visit the CO State and Local Programs page.
The Colorado Supreme Court Self-Help Center may have some of the forms and instructions you need to file for or change custody, divorce, paternity, or child support.