A golf simulator is basically a coordination of some components. The materials you will need to set up a golf simulator are the hitting mat, projector, projector screen, net, launch monitor, simulation software, computer or smartphone etc. You can skip some of these materials as all of them are not compulsory for setting up a golf simulator. So if you want, you can set up your simulator just with a launch monitor, golf hitting mat, projector and a side barrier net.
But to have a realistic golf experience, we would like to suggest you gather all of the materials.