An approval route form is basically just a simple form with an approval route added! To set up an approval route form, you can get started by setting up a simple form by referring to this article: Set up simple form.
Note: To create forms for your district, you must have form creator access. If you would like access to create forms, you will need to contact someone from your district who has people admin access.
Once you're ready to add your approval route, please reach out to Support! We're happy to help you figure out the best way to set up your approval route given your needs.