Another great resource for writing a business plan is your local Small Business Administration center. Most major cities have these types of small-business assistance resources, either in a brick-and-mortar office or online. These SBA websites almost always offer comprehensive resources for start-ups like a sample business plan, business plan development ideas, events, counseling and training services, and local resources. Check to see if your SBA website has free, online planning webinars. Even if you local chapter doesn't offer them, you can easily find a website in another region that does. These online seminars are typically self-paced, 30-minute long resources that help you understand the components of writing a business plan (which provide much more insight than a simple sample business plan), and may be offered in a variety of languages.
So how would you go about making a plan like this? Well if you know a fair amount about business, you can. It will take some special calculations and some work but if you know how to put together a Profit & Loss Statement, you can probably do it.