In the last startup where I worked, we halted all my development work to work on various revisions of our business plan a total of 3 times. This worked out to about 4 months of lost time.
In my post mortem of the now failed venture, I believe that focusing on business plans, possible partnerships, lawyers, governments etc. and not on getting ourselves to a live production state (read in business) was what killed it.
The business plan was something that became of outmust importance anytime there was someone waiving a potential sizable check infront of us. The fact of the matter though was that the business plan was nothing more than an unreadable sales document.
We never used it in daily life, which is what it should be.
Most people go out and buy or download business plan templates. There are millions of them out there. They all claim to be tried and tested. The only problem is that they are very time consuming and will never reflect a dynamic growing business.
I think it is much better to create a freeform Business Plan Backpack and ofcourse use Stake It Out to help glue it an other sites together. Here you have a way of exchanging real ideas and maintaining it easily.
Dont worry about top-down, bottom-up marketing numbers, nor outlining the “team” and how you magically will have 135,000 signed up users in 9 months. It doesn’t matter it is all made up anyway. Do not waste your time here.