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first you need to be open minded, invest is the best.
Basically, you should have to know the business that you're going to deal with. Work with the business plan first before putting up or launching a product for your guide.
Your targeted audience and place is very important. This will reffer to the marketing analysis, where you have to analize what your targeted audience needs as well as product knowing. It is very important for an entrepreneur to be an expert with his/her product -this is for you to easily solves further issues.
Gather informations and resources, know your targeted audience as well as your competitors -understand what are thier marketing strategies. Then, try to make a review.