Are you trying to create a SSID for guest access? If so, my suggestion would be to create a VLAN on a Layer3 Switch, create a DHCP scope, and create an Access List that allows internet only or whatever you would like. Then use that VLAN when you create your interface on the WLC. Leave guest unchecked and create interface as normal.
How you are configuring the wlc is for wired guest through the wlc and not wireless guest. So do you need help with wired or wireless?
If you have no guest anchor controller, then you need to setup an dynamic interface on the wlc and set the vlan id and ip address information. Then you need to make sure that vlan is forwarding in you network and you have a valid dhcp scope. On the wlan, set the interface to the one you just created and you are done.
Again... if you have another setup other than this, let us know.