Find a problem that is around your area of passion and solve it, you will not just be happy and fulfilled for putting smiles in the eyes of people by solving that problem but you will also be making money for yourself while doing something you love.

That's the primary rule to follow when you want to establish a business. You can not come with what someone don't need and hope to sell that to him.

Locate a problem, find a solution, give it for free the first time, when it works well your solution