Get the Whitepaper called Armitage – Hacking Made Easy Part 1. It covers using the Armitage GUI for Metasploit when performing pentesting.
You can download it from the following link: https://packetstormsecurity.com/files/download/108035/Armitage-hacking_made_easy_Part-1.pdf
Source: https://packetstormsecurity.com/files/108035/Armitage-Hacking-Made-Easy-Part-1.html