You just purchased an outstanding detector. Once you get familiar with it you are going to be delighted with the performance. Go through the past posts in this forum and you will find a wealth of great advice and suggestions regarding settings and use in a variety of locales. I found the posts very valuable when I got my T2 about a year ago and relied on a number of the suggestions until I got used to the detector and started trying setting out on my own. I hunt in Northern Virginia. From my experiences when I get out in a new area I initially set in the discrimination mode the Sens at 80, the Disc at 41 and the tones I leave at 1. I then go to the all metal mode and set Sens at 80, Hum I adjust until the feedback is gone or almost gone---usually in my areas this is at -1 or -2---I then go back to the discrimination mode and ground balance. I then start searching and adjust the settings if necessary. More often than not I leave the settings as is and they work great. Again, it depends on your detecting area, these settings work for me in Northern Virginia.
Good luck and have fun, the T2 is superb, an excellent choice.