If in the Discord server, you can use codes to import/export free models made by users. clicking edit will open it up in a 2013-esque studio mode, with an ingame free model tab. Upon going to the build tab, you have a starter place. You can also view "Top Rated" or "Featured," which are usually the games of highest quality. Be warned, although there are bad games, its best to play games that have a high like to dislike ratio, and avoid the ones with vice-versa.
Upon loading into Retrostudio, you immediately land in the game page, where you can choose to see many of the different games on the front page. You can also visit the avatar shop to view the items onsale, with new catalog additions every few weeks. You can go to your avatar page, and change your avatars body colors, shape, and items. Upon joining, there are a selection of games created by other players that take place in older versions of Roblox ranging from Early 2009 - Mid 2015.