Money may not be a priority at the beginning but it'll become one after a while. The financial plan explains how you're planning to make revenues.
Sounds easy? It does of you keep things simple and you validate your hypothesis. Yet often plans are pure assumptions and they're way off the reality. Not worth the pain making, unless you're forced to show a plan.
Business Ideas believes a plan is better than no plan as long as it's flexible and improved along the way. So give it a try, put figures together and prepare for changes ahead.