Refer to your checklist whenever you need to or wherever you might be. Canva designs are all saved on the cloud so they can be opened, changed or downloaded from anywhere as long as you have an internet connection. It does not require you to install anything so you can access your design on your desktop computer, laptop, iPhone, iPad or Android device.
The first three points in this startup checklist basically require you to do adequate research into your market. You have to know what the value of your offering is to the people you are offering it to. For example, there's no point in pricing your premium content at $3 a posting when the exact same content is being given away at a larger, more established site.