1) The Vicidial Manager's Manual is available on EFLO.net. Paid and Free versions are available. The Free version has everything you need to get up and running and learn the basics of Vicidial. The Paid version has a couple hundred extra pages of deeper feature configuration options that *will* come in handy as you figure out the power of this system.
2) Assuming you installed with Vicibox.com's iso installer: /usr/src/astguiclient/trunk/docs has very good information in it.
3) /usr/share/astguiclient has many perl scripts in it. They can be executed with "--help" as a command line option to get the options for their use. They can also be edited, many have notes at the top and throughout to help understand their usage.
4) /srv/www/htdocs/vicidial and htdocs/agc both have files in them, many of which are not obvious in their usage but will have notes in the top of them to assist you in understanding (many also have corresponding entries in docs mentioned earlier)
5) When you (eventually) request support on the Support forum of this board: Be sure to always list your Vicidial Version with Build. You can also include your SVN revision level if you know it. You should also include your Vicidial Install Method with Version (such as Vicibox 7.0.4 ...?).
6) "crontab -e" has many entries and some notes in it. Some of the entries are commented out, but can be activated by uncommenting them. Most (all?) are in the /usr/share/astguiclient folder mentioned earlier. Understanding which scripts run at which times and why is useful training.
7) "screen -list" shows several running screens. Those are the actual vicidial core running in each dialer to manage calls. The scripts running in these screens, once again, are in the /usr/share/astguiclient folder mentioned earlier. Many of these store their logs in /var/log/astguiclient.
Welcome to the Party!