I vehemently disagree. I would recommend not following-up with any angel investor who asks you for a business plan. You yourself should be able to credibly articulate how you envision the next 12 months unfolding and especially how you intend on spending the money you raise, but that's about it.

Financial projections for a two-month old startup are an even bigger waste of time. You want to be clear on the spend side but basically, the most you could have figured out is a working assumption on the customer acquisition cost.