All Users As Vendors

Hi,

I’m working on a project where users are invited to login to either post their dresses for sale, o buy dresses from other people.



Users are not meant to have lots of items for sell, and simplifying the process to post an item for sale is key for the success of the project.



Is it possible to automatically approve users as vendors so they are able to quickly post items for sale? Or, could all registered users be vendors?