biz idea for a teenager; selling flags
You do not need to be a manufacturer to establish a name in the flags industry. All you need is to become smart.
Imagine the number of products you could make using your country flag.
some of the products are:- Wood Pole Flag, Umbrella, Brand Stick Flags, Classroom Flag, Open Flag, etc.
You do not need to make them at all, you can outsource the making process to established manufacturers. For example, if you decide to be a supplier of umbrellas with the flag of your country, you can design the umbrella and place your signature on it and contract an umbrella manufacturer to make them for you.
Since the umbrellas have your own signature, you will be the sole supplier of these umbrellas in your country. Talk of branding.