High level diagram of a typical home:
WiFi AP/FW/Modem because it’s easy to start with.
Hmm, do I need a switch and an Ethernet device? That depends on how your network grows.
But be wary of starting off with expensive items. You should start off with the simple device and build upon your experiences.
Here the Wireless ESP devices are either ESP/Arduino, DIY or Tasmota devices (store bought but reprogrammed).