That depends... it's kind of a broad question.
The short answer is you just define the VLAN based on SSID, login method, etc.
The longer answer is more involved...
If you've got it plugged into a L3 switch you could set up a trunk connection to it and have an external DHCP server hand out your addresses..
If you don't have a L3 switch you can define VLANs on the controller, setup DHCP on the controller, and NAT out a set of addresses...
In any case you need to define the VLAN(s) on the controller and define how they are applied.
I've used both of these methods, as I have campuses with and with a L3 switch.