I am now, have been and will be wrong

Google serves up ads based upon the content of this page. When I wrote this, the ads were for bplan writing companies. Go ahead and click on the (I'll appreciate the results) but don't bother buying those services. Having someone else write up your business plan makes no sense to me. The plan should represent your thinking, and your planning. Getting someone else to plan/think for you will do you no good when something unexpected comes up.

There's so much abundant information on the web, spending your money/time/resources with these folks is unlikely to provide you with much value for your resources.
Do your own homework. If you can't figure out who to ask or where to go, that might be a sign that this isn't the opportunity best suited for someone with your background.
In funding, a business plan does nothing more than get you a phone call. The exact steps are different, but most of the time, funding goes as follows:
Find target investor -> send bplan -> meeting -> meeting ..... (due diligence) ->meeting (negotiation).... -> final terms
Then the hard stuff happens: Work to make company successful