What problem does the business have that you're trying to solve?
How will you know you solved the business problem? What will you measure? (Hint: What will your users be doing differently if your solution works? Consider metrics that indicate customer success like average order value, time on site and retention rate)
What types (personas) of users and customers should you focus on first? (Hint: Who buys the product or service? Who uses it? Who configures it?)
Why would your users seek out your product? What benefit would they gain from using it? What behaviour change can you observe that tells you they've achieved their goal?