1) Would be nice to see a few screenshots of what a final product looks like, what the sheet creator sees, what the viewers see, etc.
2) Maybe in the "Used by" section of the home page, you can have a sample sheet for each type of role.
3) I bet for a lot of these, you can create a good template that's useful for 80% of cases - e.g. class sign up templates (might be a premium feature?).
4) I think freemium might be a better approach. You can add watermarks (free advertising!), or let people create some number of sheets for free. When I see your 10 dollar price, I am inclined to not even create an account because I probably found the app through a google search and am planning to use it a single time. On the other hand, if the app is free and the experience for my first time is awesome, then maybe I'd use the app a few more times, and then be willing to pay for extra features or a removed limit on the number of sign up sheets
5) When creating a sign up sheet, WYSIWYG might nicer. I see a number of fields, but I'm not sure where/how the data will be displayed. You can just show the final sheet with text fields for data instead of actual data.