Where can I sell old things at the age of 13?

Have some stuff I would like to sell:

Once an Xbox 360 + controller and games, my old phone (Samsung Galaxy A5), a few PS3 games, a skateboard, a bike, a guitar and a few more books and DVDs.

Wanted to clear out lately, but then I have the prices for all items together, all together should be something between about 300 euro and 500 euro approximately. Would be pretty stupid if I throw everything in the trash, so I would like to sell somewhere. I'm only 13 and therefore do not have so many options. Unfortunately, Ebay is not because that would then run over my mother, and she says she has no desire to get in trouble with the sellers, etc.

Flea market is not synonymous. My dad has his own DVD shop and on Sundays he always puts the remaining DVDs on the flea market, so he knows how it goes. He said he could only advise me against the flea market because he himself would always be aware of how children and teenagers there are totally ripped off.

Would there be other possibilities?

Momox - selling books and DVD's

EBay Classifieds maybe? Then the buyer has to come to you and pick it up

If your heirs do not support you, it will be hard.

Your dad could take you to the flea market and you could sell your own stuff. Then your father could also be available to you with help and advice.

Do not you have to be of age for this?

I believe 16. But you do not have to say how old you are. When the buyer comes, you just say your mom put that on eBay classified ads