Summary: After sketching the roof and building an estimate, navigate to your project's Documents tab. Click the blue plus button in the bottom right corner of the screen and select "Contract" or "Sign contract" from the menu. (Both create a contract document, the latter allows you to capture a signature as well.)
Watch the video below to see the process:
Note: The contract you generate will include the results from the estimate option selected on the Estimates tab of your project.