Re: fretboard memorization?
kaneke- good question and it all comes down to what you want to do, what styles you want to play and how far you want to take it- Most of my students do memorize the fretboard, but I have one very gifted rocker who still does pretty amazing things without knowing the fretboard and he rarely even reads tab!
But to me, he's the exception, he has an incredible, ear, and it's filling in the gaps where fretboard knowledge would cary the rest of us much further- As noted previously, you can do a lot of work with paterns, but one of the first reasons you have to know at least the lowest 2 strings is that basic barre chords are rooted on them and most stundents like their "repeatability"-
After that, it's usually theory that brings them back to the fretboard- As you learn how chords are constructed and how scales are built, you start to understand why lots of things work (V7 to I) and why others may not work (lydian mode in anything other than bebob

At this point, you can start to see more than paterns, ie you start to recognise that C# is the leading tone into a D chord, and you start to see why the mixolidian mode give you so much fleibility covering the neck in just about every musical style.
And then the quantum leap...you start to see how all of this interacts the first time you find the octave D2 patern E chord that has been hiding just up the neck from the big old open E that you hit all of the time, you start to find inverted chords all over the neck, or you notice that the penatonic minor scale sits right on top of the associated minor chord and the same is true of the major-
And then you go into the space that very, very few guitarists ever go if they don't know the frettboard. You start to see scales up and down the string and you find yourself bridging and connecting paterns that you otherwise would never have bumbed into or been able to hear, you start finding arepgios in places that no one else has ever looked, and you start to see pull off and hameron phrasing as scales and arpegios and they all merge together. Eddie and Allan Holdsworth didn't top out their respective styles by ignoring this knowledge.
So in my it's a matter of how far you want to go- you can do a lot with record copying, video tapes, lessons, and jamming with your buddies-
But I leave you with this- If you stick with this and make it far enough, at some point the keyboardest is going to ask you, "how are you voicing that major 7?" or, the sax player is going to say " I want to double the end of your solo..is that run entirely chromatic or are you skipping the Eb?" and I've seen pretty good players just get left behind.
Good luck either way, and remember it has to be fun first!