Google Sheets beat Microsoft to the punch and introduced a Checkbox as one of the Data Validation options. You can go to Insert > Checkbox to quickly create one, and you can customize it by going to Data > Data Validation. I've updated most of the Google Sheets versions of my checklists to use that feature. I hope Excel gets smart and introduces a similar feature some day.
To help you reduce the risk of investing your time and energy in something nobody wants, we’ve created a guide to validating your membership site idea. Some of the things you can try include producing a mini version of your membership program to see if you can generate any signups before creating the whole course, as well as promoting a prelaunch offer, again, to see if you can find members willing to register, perhaps at a reduced rate, before you get started.
A checklist is a type of job aid used to reduce failure by compensating for potential limits of human memory and attention. It helps to ensure consistency and completeness in carrying out a task. A basic example is the "to do list". A more advanced checklist would be a schedule, which lays out tasks to be done according to time of day or other factors. A primary task in checklist is documentation of the task and auditing against the documentation.