I'm sure you've been told this before, but start with learning the pentatonic scale. It's really very simple. In the key of A, here it is: 5th fret, 6th string- (A) is the first note or the root of the scale. Then, 8th fret, 6th string-(C) is the second note. Then, 5th fret, 5th string-(D) is the third note. Then, 7th fret 5th string-(E) is the fourth note, and it is quite convenient that this is also the fifth of A, as I'm sure you know. Then, 5th fret, 4th string-(G) is the fifth note in the scale and the last. Hence the name pentatonic. Penta means five as I'm sure you know. So the notes in the A pentatonic scale are A,C,D,E and G. To continue the scale to the 1st string: 7th fret 4th string-(A), 5th fret, 3rd string-(C), 7th fret, 3rd string-(D), 5th fret, 2nd string-(E), 8th fret, 2nd string-(G), 5th fret, 1st string-(A), and finally, 8th fret, 1st string-(C).
Just mess around with that for awhile. The pattern remains the same no matter what key you are playing in. Have fun. If you want to know more scales, just ask. (or look them up!) Other key scales are the Minor, Major and Blues. There are thousands more, but only bite off as much as you can chew and pratices your ass off.
