I've never professionally installed around a home, but I've set up retail cameras before.
From my experience: Be prepared to shell out a lot of money. Nearly every camera model I've ever seen has an utterly terrible infrared range. Measured in a few meters. You'll need to invest in what is the infrared equivalent of flood-lights to actually achieve a good range.
Wireless cameras are notoriously finicky, but can have a good long range. You'll essentially be buying a 'kit' that comes up with the main recorder, and a few cameras. Everything else you buy is an addon to the main kit.
I am mostly familiar with Lorex cameras, and have set up multiple versions of an 8-camera set that is popular in retail environments.