There’s no real established order to business plans, aside from keeping the Executive Summary at the top. As long as you have all of the main business plan components, then the order should reflect your goals.
If this is meant solely for your personal use, lay it out as a roadmap with similar sections grouped together for easy reference. If you’re pitching this to potential investors, lead with the stronger sections to emphasize the pitch. Then if you’re unsure of what order makes sense, then just stick to the outline in this article.