The internet changes so fast that one year online equals about five years in the real world. But the principles of how to start and grow a successful online business haven't changed at all. If you're just starting a small business online, stick to this sequence. If you've been online awhile, do a quick review and see if there's a step you're neglecting, or never got around to doing in the first place. You can't go wrong with the basics.
Figure out the audience for your business plan. A business plan might be read by any number of individuals. Oftentimes, a business plan is written for investors or loan officers who need to quickly and thoroughly understand the nature of your business and your plan for success. This demonstrates that you have thought through key questions such as marketing and financial aspects, which will contribute to your ability to repay a loan or make a venture profitable for an investor.

If you want to separate your personal liability from your company's liability, you may want to consider forming one of several types of corporations. This makes a business a separate entity apart from its owners, and, therefore, corporations can own property, assume liability, pay taxes, enter into contracts, sue and be sued like any other individual. One of the most common structures for small businesses, however, is the limited liability corporation (LLC). This hybrid structure has the legal protections of a corporation while allowing for the tax benefits of a partnership.
I think you dont really have a clue about most of these businesses you claim you can start for less than 100 dollars. For one most of these businesses require some sort of degree or cetifacation or contractors license to perform for instance house painting you absolutely have to have a contractor license to perform and a special endorsement to even mess with anything built before 1978 because of lead paint do this with out one and you could be facing up to $40,000 in fines so not only do you have to pay for the license which is 250 for a regular license but you have to take an accredited course first and test which is 100 plus then you have to be bonded and insured which is a hell of alot more than 100 dollars oh and your tools and equipment your going to need let’s not forget about that and materials too because most people dont pay till your done with the job and there even more business you claim you can start for less than 100 that all require the same thing you should really stop lying to people oh also you have to register your business with the state that’s about 400 so yep just thought you should know.
You'll also need ecommerce software, fulfillment software, worry about warehousing, customer service and refunds. But that's not all. You'll also need traffic. Think search engine optimization, Facebook ads, and other social media campaigns. It is hard work, especially on your own. You could opt for Amazon's platform, which might be the easier route. But, then again, at the end of the day, this is a serious business, which could produce significant profits. So you're either all in or you're not. 
Don't sacrifice morals for a quick buck — At the outset, you'll want to do all sorts of things to make money online, but don't sacrifice your morals for a quick buck. Not only will you put people off, but you'll lose Google's trust. You also shouldn't concern yourself with things like Adsense or other ads on a blog before you have around 100,000 visitors per day. Yes, per day. 
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