If you get those and don't get them with a IP65 or above waterproof rating don't put them outside without being under a awning or other rain barrier even if they say waterproof in my experience no there not and even if you put a awning over them outside humidity/water vapor will still gather on the inside of the lens from the morning dew/heavy rains giving you a very poor blurry picture they also don't last near as long like 6 months long outside.
Depending on whether you go with TVL cameras or IP camera's makes a difference in wiring some IP camera's not all come equipped with PoE or Power over Ethernet which gets rid of the need for a extra wire for power. However your regular TVL seimeise cables are two seperate cables combined by a thin piece of plastic in the middle so you can pull them apart.
Depending on how far you want to run them and if you want to run them via trees/bury them makes a big difference here the largest continuous seimeise cable I've found that was well priced on the internet was 125 ft I had cams as far as 400 ft here and there was no way I was going to bother with wireless and batteries or solar panels or worrying about loss of signal in bad weather conditions.
As a safety feature these Seimeise cables which employ the regular D/C push in pull out plug for the power cable make this cable shorter then the BNC video cable, thus if the wire is ran through high tension tree environments lazily done without attaching fasteners for the wire to the trees it is nearly impossible to tape the two ends together without the D/C power slowly working its way out, or just breaking because of snow/ice load the cables aren't that stout.
Burying w/o conduit causes possible condensation problems between connections. The solution is Ethernet cable with PoE or a power source near the camera location, it takes a hell of a lot more abuse as it is 5 small 20 gauge wires stranded around each other into one and I'd buy it in a 1000' box and put the Ethernet connections on myself now you can now Christmas tree up up your place to yer heart's content or bury it w/o conduit just beware running it over/sharp rocks.
Be wary buying Audio equipped camera's as some vendors put in a microphone but all you can hear is the camera's internal power coil's high pitched frequency this is more a concern for offbrand PTZ camera's with high power demands. A cheap $15 mic can be had off the internet there generally RCA cables for the audio part with a standard D/C power input. You can get a cheap RCA to standard 3.5mm audio jack converter and plug this into your computer then set up
blue iris to receive the feed(i've not personally done this) but I assume it's doable
I used 100' of BNC wire for this and bought the appropriate BNC to RCA male plugins there is a good bit of definitely noticeable static from this and I may buy some more Ethernet cable/baluns to make the run or place it somewhere closer.,, Ethernet has a lot less noise than BNC but I've never had a problem with BNC video picture getting static at 400+ feet.
Edit: Also there is some noise just from my computer's built in soundcard this is standard the laptop was especially bad you can hear it from enabling a microphone through windows sound control settings even with nothing hooked to it there's still a faint hiss. You can correct this with aftermarket soundcards
