right, I'm bored at work.
guitar is probably about this more than anything.
1. get your fingers working
2. know what notes to play
a good, but dull, way to get your fingers used to playing properly is this.
on the lowest/deepest string (the low E) play these frets....
12, 13, 14, 15
note: one finger per fret (index for the 12, middle for 13, ring for 14, little for 15).
then do that on the next string up. and the next and so on until you get onto the highest string.
then, on the highest string, go
14, 13, 12, 11. (14 = little, 13 = ring etc) then do that on the second highest string, third etc.
then work up on the 10, 11, 12, 13 and back down on 12, 11, 10, 9.
in tab it looks like this
e -----------------------------------------------------------------12-13-14-15-14-13-12-11----------------------------------------
B -----------------------------------------------------12-13-14-15--------------------------14-13-12-11---------------------------
G ----------------------------------------12-13-14-15-----------------------------------------------------14-13-12-11-------------
D ---------------------------12-13-14-15-------------------------------------------------------------------------------14-13-12-11
A --------------12-13-14-15--------------------------------------------------------------------------------------------------------
E -12-13-14-15---------------------------------------------------------------------------------------------------------------------
e ------------------------------------------------------------------------------------------10-11-12-13-12-11-10-9-----------------
B -----------------------------------------------------------------------------10-11-12-13--------------------------12-11-10-9-----
G ----------------------------------------------------------------10-11-12-13------------------------------------------etc
D ---------------------------------------------------10-11-12-13--------------------------------------------------------etc
A -14-13-12-11--------------------------10-11-12-13--------------------------------------------------------------------etc
E --------------14-13-12-11-10-11-12-13--------------------------------------------------------------------------------etc
by the time you get down to play frets 3, 4, 5, 6 the distance between frets will definitely give your hands a good stretch.
Another thing to consider is alternate picking. start the whole exercise with a downstroke with your plectrum (play towards the floor) and then come up for the next note and down for the next and so on.
12 (d), 13 (u), 14 (d), 15 (u): repeat
It's not very interesting but it's really good for getting some sort of form happening. The way to approach an instrument is to know what the 'good' technique is, so that you can throw it away if you want to later on.
Three chord punk stuff can be greatness but if that's all you know your expression will be like Karen Matthews getting angry rather as opposed to Bill Hicks doing it.