Thanks to all for the input!  The more I read, the more difficult it seems....and I never thought it would be easy, at all.  Funny that there's an ad for "guitar god" Claude Johnson  on the right side of this page as I'm typing right now, after all the bad press he's gotten on this website.  I do understand that it's not as easy as just not selling an ad to him, there are intermediaries.

I'm a complete beginner, I'm buying a guitar in 1-2 months, so I've been doing a lot of reading to prepare myself for my first lessons with an instructor.

1. I've noticed that you can play a C note for example in multipe frets on multiple strings.  is there any difference between these C notes? (different pitch??)  If there is no difference, then how do you decide which C note to play?

2.  I'm a pretty good typist as I sit in front of a computer keyboard all day....there is a raised ridge on the F and J keys so I always know my fingers are in the correct position without looking at the keyboard, so I type without ever looking at the keyboard, which greatly improves speed.  Is there any such convention on the guitar so that you always know what fret your fingers are over without staring at the guitar neck constantly?

3.  I'm figuring out how to use the internet for lessons also, I've heard to stay away from Claude Johnson, to look at JamPlay and JustinGuitar.com, Paul Gilbert, among others.  I'd like to pick one on-line source (or DVD) for the first several months at least and stick with it, as jumping around from site to site will confuse me more.  I was just looking at Justinguitar.com and he seems to be into finger picking whereas I'll be playing electric guitar for rock and so I want to use a pick....does he do lessons for electric with a pick?

Thanks in advance for helping me to start the long steep uphill climb to reaching a "decent" level.  I hope I'm up to the climb!