This is a video that shows you the current marketplaces, how to find them and how they work. All you need to do is get a cloud wallet, get some NFT assets like Tigerking and start selling and collecting on the marketplaces.
I forgot to mention https://collectables.io, which is one of the major up and coming exchanges, currently the 3rd largest. Feel free to check that out!
Video on how to get WAX:
Anyobservation Experience Podcast: