Welcome to the site!
Start with the stickies at the top of the Titan and then other forums. You'll find tons of great info there. There is an incredible amount of information on this site. Just search for whatever your looking for, and if you can't find it then post. You'll find lots of help in here.
Try this for all those "must have" apps:
http://forum.ppcgeeks.com/showthread.php?t=17859