From my experience I would like to add to Scott's answer. This is from the Table of Contents of a Final Deliverable which I had to create. Admittedly, all of this won't apply to your situation though anything which does should be documented by either you of the people who did the implmentation.

1. Capacity and Scalability Projections

2. Equipment Configuration Procedures

2.1 UPGRADING IOS AP TO LWAPP

2.1.1 To Install the Upgrade Tool

2.1.2 Running the Upgrade Tool

2.1.3 Uninstalling the Upgrade Tool from a PC

2.1.4 Post-Upgrade Tasks

2.1.5 Converting a Lightweight Access Point Back to Autonomous Mode

2.1.6 Using a Wireless LAN Controller to Return to a Previous Release

2.1.7 Using a TFTP Server to Return to a Previous Release

2.1.8 Troubleshooting Tips for IOS to LWAPP

2.2 INITIAL WISM CONFIGURATION

2.2.1 The WiSM Hardware Requirements

2.2.2 Configuring Communication between the Supervisor 720 and Cisco WiSM

2.2.3 Verify Communication between Supervisor 720 and Cisco WiSM

2.3 UPGRADING CODE ON WISM

2.3.1 Steps to Upgrade Cisco Code on WISM Controllers

2.4 INITIAL WIRELESS LAN CONTROLLER CONFIGURATION

2.5 LAN SWITCH CONFIGURATION

2.5.1 Remote Office Switch Configuration for H-REAP

2.5.2 Campus Switch Configuration for LWAPP

2.6 H-REAP CONFIGURATION

2.6.1 Hybrid REAP Guidelines

2.7 DHCP OPTION 43 CONFIGURATION

2.8 ACCESS CONTROL SERVER INSTRUCTIONS TO INSTALL A CERTIFICATE

2.8.1 Create a Certificate Signing Request on ACS (private key)

2.8.2 Create a Server Certificate

2.8.3 Install CA Certificate on ACS

2.8.4 Install Server Certificate on your Appliance

2.9 EMPLOYEE LAPTOP SETUP FOR WIRELESS

2.10 GROUP POLICY CONFIGURATION

2.10.1 Group Policy Configuration Steps

2.11 WIRELESS GUEST ACCESS VIA WLC

3. Glossary of Terms

4. Protocols Used to Support Wireless Deployments

4.1 Extensible Authentication Protocol (EAP)

4.2 Dynamic Host Configuration Protocol (DHCP) Server Option 43

Hope it helps.

Best,

Paul