Clear & Concise: Make sure your policies regarding Shipping, Returns, Conditions, and Terms are readily available and clear to customers. Make it easy for potential customers to do business with you by providing steps and contact point (phone, email, or online forms) for dealing with different situations (ordering offline, exchanging a products, et al).

Again, unless your research makes it clear that your audience is ready and waiting to join your program, don’t produce your entire membership program just yet. Starting small and creating just enough top-quality content to keep charter members happy, then seeking their feedback before moving on to the next stage of production will help save you both time and effort in the long run.

Consequently, it’s vital you do all you can to serve those members who’ve invested in your program. Adding a help desk system to your website can improve communication, while creating new and varied forms of content for your membership site is sure to increase the perceived value of your program. You can also implement tools like Churn Buster, which can reduce the risk of satisfied members involuntarily quitting your site—something you may not even be aware is happening.
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.
Excessive dependence of checklists may hinder performance when dealing with a time-critical situation, for example a medical emergency or an in-flight emergency. Checklists should not be used as a replacement for common sense. Intensive training including rote-learning of checklists can help integrate use of checklists with more adaptive and flexible problem solving techniques.[citation needed]