Hi Mortarman, you probably already know that there are numerous types of hunting with metal detectors. Is there a specific type of hunting your interested in? Zip Zip is a well received electronic prospecting book, Relics? If you have access to a public library, get the library card and search for Charles Garrett, His "Modern Metal Detectors" book is geared toward his brand of detectors, it has basic material that apply to all detectors. Library searches Garrett, Jimmy Sierra, Metal Detector,...
My local library had a couple of different books on metal detecting, you might want to check your librarys video selection as well.
Cruise the different manufacturers web sites, as they all have a newletter of sorts. And this forum has alot of experienced users and user traffic.
I too have a Tesoro Vaquero, if you can get the 5.75 coil in addition to the stock 8x9, you will have a great setup.
Good Luck,
Square Nail