Doktor_KlingeL

There's 2 ways to segregate the network into different sections:

Physically or Virtually
 
VLANs - Virtual LANs - are the virtual way to do it, by splitting a switch into 2 distinct networks.
 
Physically here would (probably) be easier.  Just run a cable from your NVR to your PC Directly.  Don't have it touch the network.  (And a USB NIC would be more than enough to use this, if you don't have two NICs on your mobo.)

Thanks, I thought I went overboard with this setup. Would it be possible to make a portion of the network completely boxed off so it behaves like a seperate network? What I mean is for example I dont want to expose my cameras and security stuff to the internet. I heard and read about vlan but do I need special hardware to do that?
Thanks, that should be more than enough!

you can easily run 30M / 100' cables before any issues happen.  (Assuming decent cables)
 
That overall seems fairly reasonable, and sensible for your setup.    (For the RPi, see if you can get a PoE Hat for it, so you don't need an AC Adapter to run it)

The distance limit is 100m (~300) feet depending on the speed and assuming no junk cables and you're not running it along high voltage power.
Cat5e is rated 2.5Gbps up to 100m (might be 5Gbps I can't recall off hand)
Cat6 is rated for 10Gbps up to 55m or 5Gbps up to 100m
Cat6a is rated for 10Gbps up to 100m

No it's ok, it's possible the fan could prematurely die but it's unlikely anyway.
 
The problem is that you'll have to dust them way more often if they always run so much...
 
Live with it, or just let the card only start going at max speed when it reaches, say, 80 degrees.
 
Avoid getting temps higher than 90, above should still work but is a bad idea.

Way overkill, stock cooler is fine here.
 
Id get a single larger drive, those are tiny hdds
 
Id get a higher quality drive
 
Id get that asrock rack board if you can, but go b550 if you can't
 
Id get some ecc, not much more, and nice to have