I want to sell my iphone 5, how do I go about doing this?

I want to sell my iphone 5 at a store near my school. Is there a certain age limit required when doing these things (I'm 14.5) also, do we need to sign any papers or fill our any forms? How much money could I get for y mid-condition device? It's unactivated but only requires a sim card. I like in the US.

You might need an adult with some form of ID, thats the way it is in Ireland anyway.

Make sure icloud lock is removed, all places require that before they would buy it or take as trade in.

Take it to pawnshop is the fastest way.