I've written, and rejected, more than I care to think about.
1st question, is why it's needed. If it's for presentation to a bank / accountant, to secure investment, grovel for a an overdraft / loan, the only thing that counts are believable figures / projections, based on prior business performance or experience, the assets you're bringing to the business etc. backed up by hard research data on the market your getting into.
Most banks have free templates that you can adapt to specific requirements and they're laid out in ways in that bean counters like.
If you're pitching it at a private investor / business angel, then you have a bit more latitude in selling an idea to a hopefully enthusiastic partner / investor, who maybe knows something about the area you want to get into and wants to be a part of it. If the guys an experienced businessman, the numbers will still count, but the idea and enthusiasm behind the business probably counts more.
In the current climate, banks are extremely reluctant to the idea of 'risk' and you're probably on a non-starter if you have little equity. If it's just to secure a business bank account then they shouldn't have any issues.
Get the basics right in terms of numbers, grammar, spelling, layout etc, and it'll add loads to the credibility.
Any business plan is a matter of opinion, depending on who it's aimed at. Whether it's a formal plan with a years financial forecast, or dream scribbled on a beermat, Good Luck !
V