Learn about IP Telephony
Before you get started, you need to learn about IP Telephony. Read this article about the Parts of a FreePBX System
Next, read the Installation Guide.
Finally, read about the First Steps After Installation.
Other Documentation Sources:
- PBX Setup Guide
- Voip-info wiki - Contains a lot of documentation about VoIP in general, as well as many Asterisk-specific things.
- Asterisk Primer
- Asterisk: The Definitive Guide, 3d. Edition
Other Help Sources: