I do find lots of nickels, also lots of pulltabs, and I found a nice 14k wedding band while at it ina site that promissed nothing but trash according to me, heck, was I in for a surprise when I dug that hole and saw this thing stuck in the roots shining:
This is how my Explorer's Discrimination Pattern is set:
Some people put a limit to the pulltabs they dig, for example one day you'll say to yourself "50 Pulltabs and that's it!" and if you find jewelry while in the middle of the limit you can start counting again or keep at it until you reach your limit or get tired of digging trash, so if you'll switch from time to time I'd suggest you make a program that includes jewelry (pulltabs, foil, etc.) and another one eliminating them so you can switch when you like.
If you want to find Half-Dimes, 3-cent pieces, gold coins, etc. In a place that looks like it could yield those finds I'd suggest to hunt in IM-16 OR hunt accepting a wide array of Non-Ferrous items.
If you're interested in Jewelry, then by all means dig pulltabs and foil, if you don't chances are you will find little if any gold at all.
The Explorer is a machine that you can adjust to whatever you'd like to find, it is really a user friendly machine. Hope this helps.