1. striking the string creates the vibration and once it disrupts the magnetic field on the pickup that's it - how about when you don't strike the string at all, like when you tap on the body of the guitar? The vibrating wood imparts vibration on the strings, which in turn do their thing on the pickup. The body of the guitar, the nut, the bridge, every part of the guitar is now directly influencing the sound you hear out of the pickup. Remember, only the magnetic field disturbance is being amplified, and tapping the guitar has started the strings vibrating. How can that happen without the wood's tonal qualities affecting the waveform?

Before doing a setup, I’d recommend you put a new set of strings on the guitar. Specifically put the type of strings on that you intend to use in future, since different gauges (and sometimes brands) can require a slightly different intonation setup. If you don’t know how to restring a guitar, then have a look here: http://diystrat.blogspot.com/2011/08/stringing-guitar.html
Originally equipped with P-90s, it wasn’t until 1957 that the most significant change was introduced: humbuckers. Humbucking pickups—two-out-of-phase coils wired together to cancel or “buck” the hum produced by single-coils—weren’t a new concept. But Gibson technician Seth Lover’s refined PAF (patent applied for) humbuckers produced a higher output with a clearer, fuller tone that solidified the Les Paul as the classic we know it as today. From Goldtops to Black Beauties and the ever-iconic sunbursts, Les Paul guitars come in almost limitless varieties, making them a staple of blues, jazz, rock, soul and country.
Anything for which they are wired and/or programmed.  One great example is my first real guitar, a Carvin V220.  It had two humbuckers in a sorta heavy angular gibson explorer body.  Each pickup had volume and tone with a 3 way selector for either or both pickups to be on.  In addition, you could toggle switches to split coils on the humbucker to do a good approximation of a single coil pickup.  Further, you could toggle in/out of phase to get a Peter Green tone or other effects.   Tom anderson guitars have great configurations.  I have gone to lighter strats in recent years and usually replace the pickups with handwounds and customize my 5way switch depending on the guitar.   I love true single coils except that I prefer a humbucker in the bridge. 
Are YOU joking? only 3 real real ones? I’m gonna go ahead and assume your young and don’t have much musical exploring under your belt yet. Clapton, Hendrix, King…. 3 very good choices but also pretty narrow minded buddy. Jimmy Page? Django Reinhardt, David Gilmour, Steve Gaines, LES PAUL, Chet Atkins, Gary Morse, John Petrucci, Yngwei Malmsteen, the dudes from Dragon Force!, Rory Gallagher, Stevie Ray Vaughn for god sake!, Robert Johnson, Joe Bonamassa, Buddy Guy, Van Halen, Joe Satriani, Kirk Hammett, Dimebag Darrell, Jeff “skunk” Baxter, Jerry Reed, Andre Segovia, and YES John Mayer can really play!, I could go on and on……. ONLY 3 REAL ONES? WTF? Broaden your horizons my friend. only 3 real ones…. face palm…… failboat.
Next up we have the specialty electric guitars. This category consists of several different types of electric guitars, but we’ll start out with 12-string electric guitars. The fact that the low E, A, D, and G strings all feature higher octave strings while the B and high e strings both have additional strings that are tuned the same, electric guitar 12-string models have a distinctive shimmer and richness to them that guitar players love. Guitar players who favor heavier genres like death metal or hard rock may want to add a 7-string, an 8-string, or even a 9-string electric guitar to their rig for when they need some extra low-end growl and power. Other specialty guitars include baritone guitars, double neck electric guitars, and pedal steel guitars & lap steel guitars.