1. You can still access the Ruckus management interface through the Ruckus APs even if the Ruckus switch is removed from the network. From the interface, you can manage the APs. To get to the interface, you need to browse to the IP address of any one of the connected Ruckus APs (the AP IP addresses can be found from your router management page or by typing arp -a in cmd line).
2. Yes, give the APs a different name (ssid) than your Router WiFi SSID. Then connect to the AP SSID. If you connect to that AP SSID, you're connected to the APs