What pfisch is saying, selling stuff on the Internet is not a startup. E.g. if I'm starting a flower shop business, that's not a startup, that's just starting a business.
The difference between a startup and a business is that a startup is usually trying to solve a problem (often through the use of technology, a.k.a. hi-tech) in the hope that the "invention" pays off. These sorts of high risk businesses often don't get loans from banks. That's where investors come in.
So, as pfisch is saying, selling stickers on the Internet is not a startup.
I hope you guys do well. It looks like a well executed project.