Wich document you recomend to deploy and install WLC 4400 and LAP 1252 in good way ?
Deploying Cisco 440X Series Wireless LAN Controllers
Deployment Guide: Cisco Guest Access Using the Cisco Wireless LAN Controller, Release 4.1
Cisco Wireless LAN Controller Configuration Guide, Release 6.0
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.