Hi Stets, firstly, welcome to the forum and secondly congrats on your new to you Deus. The Deus is a fantastic all-around machine and I am sure you will like it very much.
First things first, I would go into the menu and "Restore" all of the programs to their original state. You never know what might have been changed by the previous owner. Restoring everything to factory presets will give you a good platform to build on.
After you have restored all of the programs, I would not change a thing for your first 20 or so hours of hunting and just go out and have fun in the stock modes and see which one you like best. After 20 or so hours, you might be ready to start playing with things a bit. Be careful here. I have seen more than a few guys on here get frustrated with the Deus because they started changing things too quickly. You need to understand the effect that making a change has on all your other settings before you decide to change something. Learning the effect takes time, period.
So, my recommendation. Take it out for your next 20 hours in factory presets and just have fun. Learn the nuances. concentrate on the shape and texture of tones and take a mental note of what a tone sounds like before digging up your target. You will quickly learn the "sweet" and "round" sounds of good targets as opposed to the "scratchy" and "spitting" sounds of many bad targets.
I'll stop it there as you don't need too much info at this point but if you have any questions, feel free to ask away.
There are a lot of great people on this forum who are always happy to help. Another place to check for more info is here:
http://www.xpmetaldetectorsamericas.com/faqGood luck and let us know how you get along. -Marc
XP Deus / Large Coil / Garrett Pro Pointer
Minelab E-Trac / Sun-Ray X-1
Minelab Excalibur II 1000 / Vibra-Quatic / Anderson CF "Shorty" Setup For Diving
Minelab Excalibur II 1000 / Anderson CF Straight Rod