The nature of business is based on having something that someone needs and receiving something in exchange for it, this is how everything started back in time when the people traded items in exchange for other items. Then, everything evolved into an economic system where people sells products in exchange of money, those items are results of ideas and creativity coming from one or several individuals working together with the ultimate goal of selling theirs products.
We all have the capacity and the creativity to create (at least in your mind) something that other people may need and you as the author of the idea can sell. The main key is to believe in yourself to bring those ideas into reality, many times we need help from other people like developers and engineers for the construction and advise of possible issues that need to be corrected and considered before the building phase begins.
If you trust in yourself and come up with great things then you might also already know or have a general view of how to sell and who to sell your product. This is when the marketing strategies come into play, as you are the inventor then you know who will buy your products and you will come up with great marketing and publicity for it.
Online marketing and business can be highly effective in many cases, looking at the connected (internet) world that we live in, a very high percentage of your possible clients will be looking for a product like yours in the internet and therefore a online store will become very necessary. You can easily manage your business and send your products via mail to your clients, you can accept a big variety of payment methods and the best of all is that you can do all of it in the comfort of your own home.
Start thinking and give yourself the time to convert into reality those great ideas that you have, remember almost everything you see around you was in someones head one time! and you have the same right to contribute as all of us.