A method includes: detecting a request to create a variable print product that will be physically printed using user-provided values for a plurality of predefined elements. In response to detecting the request, the method includes: displaying a user interface with: (i) a preview region that includes a preview of the variable print product and (ii) an editing region that includes a subset of the plurality of predefined elements, the subset including a first element. While displaying the user interface, detecting, at the electronic device, user input that provides a value for the first element. If the first element is associated with an input-acceptance rule, the method includes: determining whether the user input satisfies the input-acceptance rule. If the user input satisfies the input-acceptance rule, the method includes: accepting the value and updating the preview of the variable print product based to include the user-defined value for the first element.