My surveillance project, I understand just enough to get in trouble

So the project I'm working on, I'm using 4 cameras, I have purchased a ZOSI H.265+ 5MP Lite CCTV DVR 8 Channel Full 1080p, it doesn't come with a hdd or camers, so I was going to purchase

Western Digital 4TB WD Purple Surveillance Internal Hard Drive HDD - 5400 RPM, SATA 6 Gb/s, 64 MB Cache, 3.5" - WD40PURZ

and

ZOSI 1080p Dome Security Cameras (Hybrid 4-in-1 HD-CVI/TVI/AHD/960H Analog CVBS),2MP Day Night Weatherproof Surveillance CCTV Camera Dome Outdoor/Indoor,Night Vision Up to 80FT

I just don't know if this will work, am I missing something? My knowledge level is probably a minus something out of 10, could really use help. Thank you everyone.