@B_NancyMarie 

I assume you are using the AP in 'Standalone' mode.  

There will be a setting in the Wireless SSID setup on whether or not to 'Broadcast' the SSID (network name).  That's standard and easy.

The AP will act as an extension of the Archer router, as if the devices connected to it are plugged directly into the port that the AP is physically plugged into.  If you want to block all traffic, except traffic from the camera, you would need to implement some rules such as ACLs or Routing Policy to deal with any 'other traffic'.

An 'advanced' approach, you might consider a unique SSID (the AP can support multiple SSIDs) with one SSID dedicated to the camera and mapped to a special VLAN, all other traffic would go via your standard SSID and second VLAN and be dealt with as you see fit (ie by time-of-day or other filtering rules, including forwarding it to nowhere). 

Please note that even with the exact same network name (SSID) and security settings, you won't get 'seamless' roaming between the internal wifi of the Archer and the external AP.