How can I start an online business as a teenager?

Hello! I'm a 16yr old teenager and I currently have an idea to start a business of my own online. I'm very passionate about technology and user interface design and I would love to start a website where I can sell UI kits for a price. My question is, can I do something like this as a minor? Do I need to fill out some sort of paperwork before or can I just put the website up and start selling my work? 

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