It was the first machine i have put over 100hrs into, pretty awesome little rig and i were you, from experience try and get an "AT Pro International" - i would say start in pro zero mode with Iron audio ON, discrimination 0-25 so to include some small small gold items, and try to get a 5x8 cool as it's much lighter, way better separation, still a DD coil... It's a good machine
Dig anything 45 and up repeatable within +/- 5 if slight jumpy. Don't be afraid of junk, gems hide sometimes and you never know what will come up. Best of luck!.