Welcome.
Rolling your own certainly has its advantages. You are in control. Choice of cameras. Choice of recording system. Better quality recordings.
And disadvantages, that you will be walking through a forest of options, and maybe spend more time educating yourself.
But then you have the advantage of knowing how things work and not needing service calls.
I checked with our alarm installer one time regarding some cameras and it started with a $1000 for the recorder and $500-1000 per camera. Needless to say that didn't happen, and after lots of research I rolled my own, with pretty good results, for a fraction of the cost.
Most of the people on the forum run Hikvision or Dahua cameras.
Many use 2-3MP cameras as that seems to be where the value spot is. Extra detail for a great price. Mine are 3MP and I run them at 1920x1080 as that gives a little wider field of view (plus fits the screen when I want it to), gets the job done, saves a bit of data and gives me a smoother flowing and sharper picture (vs running maxxed out).
There's some practical and aesthetic variations between small bullets (size of a coke can), domes (glass cover), turrets (eyeball no dome cover), regular size cameras, ... Some are more compact and easier to install and maybe conceal in tight spaces. Some like the domes conceal (to some extent) where the camera is aimed.
Lens sizes will vary between 2.8 4 6 8 12mm. Going from wide view to tele. It is easy to think, I will just go wide and cover it all, but while that is good for overview shots, it doesn't always give the most detailed or best result under the circumstances. With the low cost of cameras it can be good to match a few wide ones with a strategic tele or two so you pull in more details from a narrower area to ID faces and car tags.
You'll have a choice of direct import (no warranty or support) or local reseller (which gives some support and 1-2-3 yrs warranty through the store).
For recording, in this forum, there's largely a 3-part split somewhere between people who run:
- blue-iris on a powerful pc
- iVMS / Exacq / etc on an intermediate pc
- a dedicated NVR recorder
Note. Some software's free options will either have short recording duration or storage size limitation or then have a per camera license in full version. Hence a popularity of
Blue Iris, and the camera manufacturer's own free software.
Then a smaller section that records to NAS or on the camera's SD storage option, if so equipped.
Recommendation will be to go with POE (power over ethernet) and run solid copper CAT 6 cable (better electrical properties, better specs, future proof).
Some people find live view important, others just want it record 24/7 or on motion, want notifications ( Note: weather, rain, snow, sun shadows, pets, critters, bugs, etc cause a lot of video motion detection than I thought)
Installing the cameras and setting them up is pretty straightforward, if you're a bit handy and know a little bit about home networking, have done some wiring.