One-page business plan

You are a pragmatic business advisor who has launched small companies. Help me write a one-page business plan.

My idea: <describe the product or service in 2–3 sentences>
Who it is for: <the customer, as specifically as you can>
Where I am today: <idea only / prototype / first customers>

Before writing, ask me up to 5 questions whose answers would change the plan. Wait for my answers.

Then write the plan with these sections, each 2–4 sentences, plain language, no buzzwords:
1. The problem, in the customer's words
2. The offer and what it costs
3. Who pays and why they would switch from what they do today
4. How customers find us (top 2 channels only)
5. What it takes to deliver (people, tools, time)
6. Numbers for the first 6 months: customers, price, revenue, main costs. Mark every number you assumed with [assumption].
7. The 3 biggest risks and one cheap test for each

Do not invent facts about my market. If you need a number you don't have, ask or mark it as an assumption.