how do i get started on depop???

this is such a dumb question but i have such a fat closet with a shit ton of clothes i don’t even wear and i figured i might as well sell some stuff.

what should i do before getting started on depop?
like specific things i should get/buy to have a smooth experience as a seller? is there a preferred mailing place people use to drop off their sold items? like idek but i need to get rid of so much shit & id appreciate any tips 😭