Deploying Cisco 440X Series Wireless LAN Controllers

http://www.cisco.com/en/US/docs/wireless/technology/controller/deployment/guide/dep.html

OR

Deployment Guide: Cisco Guest Access Using the Cisco Wireless LAN Controller, Release 4.1

https://www.cisco.com/en/US/docs/wireless/technology/guest_access/technical/reference/4.1/GAccess_41.html

OR

Cisco Wireless LAN Controller Configuration Guide, Release 6.0

http://www.cisco.com/en/US/docs/wireless/controller/6.0/configuration/guide/Controller60CG.html

Frankly, I'd read the latter because this is the latest release and will encompass every WLC in the Cisco inventory. This also includes the minimum WLC firmware you require to get the LAP1250 to join your controller.

Hope this will assist you.