Have a look here: https://m.reolink.com/us/home/

Also search Reolink Camera System on Amazon. I’ve used several of these over the past few years. The basic steps are: Plug the video recorder box to the network. Plug the cameras into the video recorder box. App on your phone connects to the video recorder box. That’s about is for a simple install. There is a world of details to consider though. How long do you want to have access to a recording before it’s overwritten. How much detail do you want in the video during the day? At night? General surveillance or more advanced features like people detection? If you are a little more tech savvy with a bigger budget, the Ubiquiti UniFi Protect app has gotten much better. I’m exploring switching our NVRs out and using that. Their AI Key seems interesting too, but way overkill for just general surveillance needs.