I see people talking about “homerunning” and stuff LOL.
"Homerun" refers to cabling that runs directly back to the DVR location (the "home" of the system).
PTZ capability isn’t very important to us… I already got one of our 2 PTZ cameras working but was curious if it’s easy to add more or would I need some additional equipment? I’m not sure how to wire another because the A/B are now occupied in the back of the DVR. Can I put the other PTZ camera in the same A/B and have them use a different channel or something similar?
Yes. With most protocols (such as Pelco D and P), PTZs are assigned an ID number, so you can connect multiple cameras to one controller, then select which one you want to control by selecting its ID. In many cameras, this is set via rotary or DIP switches on the camera; in some, you may need to connect just the one camera, go into the menus from the controller, and change the ID through the OSD (on-screen display). Almost all PTZs will display their protocol, baud rate, and ID when they're first powered up.
Naturally, all cameras on a single output must be using the same baud rate and communication parameters (8N1, etc), but they don't need to use the same protocol.