Well I covered most of this topic in my How to Choose a Security Camera article.

Basically, for myself I think you want POE cameras and a POE switch. Now POE switches have maximum watts that they can provide for your cameras. They have an overall limit and a per port limit. Most POE switches have 30 watts max per port, which is sufficient for each camera, but the overall total is something that is more likely to screw up your plans.

For example, Netgear has 2 different models of 8 port POE switches. One has 60 watts max, so that one is going to be able to power two or three cameras. The other has 123 watts max, so that one is going to be able to power 5 to 6 cameras (I believe).

I got the 123 watt model and it for sure works with the 4 cameras I got. Now that leaves 3 ports that I can use for non-POE connections. So in my setup:

Port 1: Uplink to rest of the network (to the modem/router); Port 2: North Camera (up to 30 watts), plus LAN/internet services. Port 3: East Camera (up to 30 watts), plus LAN/internet services. Port 4: South Camera (up to 30 watts), plus LAN/internet services. Port 5: West Camera (up to 30 watts), plus LAN/internet services. Port 6: Provides LAN/internet services to the shop. Port 7: Provides LAN/internet services to the kitchen. Port 8: Provides LAN/internet services to the laundry room.