To create a new product go to Media Kit > Medium > Property > Collection.
Once in your collection you can create new products!
Create New Product.
1. Type in all the required information on the General tab. Bonus points if you upload some photos as well!
2. Toggle over to the Pricing and Variants tab.
3. Click on Add New Variant.
4. Add the Variant's information.
5. Add attributes to customize your product even more.
6. Go to the Settings tab to create your fulfillment method.
7. Click on Add New Method.
8. Fill in the required information.
9. Click on Select & Save Changes.
10. Give your Template a name.
11. Go back to Pricing and Variants.
12. Click on Save Changes.
13. Create all the Products needed for that collection (i.e., full page ad, half-page ad, etc.)