The Commando is Wal-Mart's version of the Tracker IV in Cammo...You can find a good manual for it here:
http://detectorx.com/manuals/bountyhunter/bounty-hunter-metal-detector-manuals.html
To start, read the manual at least 2 times, then follow the instructions for air testing the machine to get used to the sounds the machine makes with each metal type...This machine will not tell you exactly what is under the coil, or how deep it is...this will come with getting familiar with the machine. After air testing, go out in your yard and throw some items on the ground...I suggest a nail, a screw driver, some tin foil (a small ball, and some that is flat), pull tabs (both types if you have them), screw cap, a zinc penny, a copper penny, a nickel, a quarter, and a half dollar if you have one. See what sounds these items produce from the machine (sounds are better heard with headphones, and they save battery power). For starters, dig all signals until you get used to the machine...You will dig a LOT of junk, but it will be well worth it when your able to tell the junk from the good stuff...
Congrats on the new machine and Happy Hunting,
BH-LandStar