A lean business plan is way easier than a traditional business plan. The core plan is four steps:

1. Set the strategy. It’s about bringing your identity, market focus, and business offering together, for strategic alignment. This is something every business owner does all the time. Just remind yourself.
2. Set the tactics. Execute strategy with  tactics to macth. Think of pricing, channels, messaging, features, benefits, and so forth.
3. Do the essential numbers. Calculate basic numbers you need to keep the business running. Sales forecasts, costs, spending. The core numbers that keep your doors open. Plan, track, review, and revise.
4. Set the execution. List concrete specifics you can track. Who does what, when, and what does it cost? How much money does it bring in? Milestones, performance metrics. This is management. 

Or just take the next step now …