Before you create classes and templates, you may want to input some related information into ClassDuo:
Locations: Under Locations, you want to input your organization's location with its address.
Instructors: Under Instructors, you want to input information about your class instructors and how to contact them. If your instructor is a ClassDuo user, you can connect them in this way so they have the organization permissions you want them to have.
Class Registration Form: Under Organization > Class Forms, you can use what's already built (Default) or build your own depending on your different kinds of classes and the information (Create New Class Form).
Class Agreement/Waiver: You can have people agree to your registration requirements, click on Organization > App Messages > Class Agreement / Waiver Text and you can add the text of your agreement there in the field. More information on Waivers can be found here.
Class Add-ons: If you want people to be able to purchase anything for the class (extra clay, etc), you can set this up in Organization > Class Addons > Create New Class Add-on.