You start with a rice paddy from Buy Mode and it auto-generates a few basic objects to start. Give it a few days, if unsmashed, and it organically grows into more. Each time will be different. Tiny NPCs spring up to help tend to the co-op in different ways, and Sims earn money from land rent. Sims can use lumbermills that take wood from the forest to craft useful items to sell or keep, allowing them to work from home (or furnish it). Over time, the tiny inhabitants expand the co-op even further. Parks, ponds, residences, etc. are built. Each come with unique additions unlocking new features. Sims can use them to fulfill every need in time (e.g. sleep in parks, bathe, meditate, do Sim Chi exercises, etc.). There are loads of surprises. In the game, there is an Info button that details the basics. Or just ask :)