Domaining101: a landing page is key to success in selling your domains! This is how many potential buyers can find you, make contact with you. However, you don't have to set up hosting and your own website(s). There are many options available, services and marketplaces, where you can showcase your domain(s). For example: Efty, Undeveloped, Bodis, Afternic. Also: BrandBucket, BrandPa, SquadHelp (these last three specializing in brandable names). Some registrars offer landers, too. For example: Epik, NameSilo.
Yes, That is 99% of domaining industry. Most domaiers don't know how to put up a website and don't even want to learn. They just sell domains. That is the focus of this forum.