Your business plan lays it all out. It details what you sell and where your profit comes from; how much inventory you’ll have on hand and where you’ll store it. It lays out your return policy — and you’ll need one of those. Most important, your business plan details your total start-up cost, from your ad campaign to Web designer to monthly server fees.
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.