Writing a Business Plan: How much Information is Needed?

by Helen
(USA)

Writing a business plan is totally new to me: how much information do I need to provide or use to develop an effective business plan?

I've hired someone to help me in writing my business plan. The forms they gave me to fill out are so extensive regarding assets; liabilities; daily expenditures; future forecasting; asking dollar amounts for every expense category past, present, future; sales forecasts and projections - does this sound normal?

I am reluctant to provide so much detail; am I being too cautious? Is this what is needed for writing a business plan? I'd appreciate your feedback. Thanks.