I've played trumpet from 6th grade to Senior Year of college. I learned no theory during this stint except for one class while I attempted a B.S. in Music .. I barely made a C in Music Theory (though I should've failed

). However, I rocked at Ear Training.
So I took the intervals that I learned in Ear Training and applied them to the guitar, allowing me to teach myself by ear. I skipped chords because I didn't want to play chords .. I wanted to play lead!
DON'T DO WHAT I DID! Seriously, I can do a fairly diverse amount of lead work (as my coverband covers 40-something 80's songs), but I cannot play most of the chorded rhythm stuff - unless it's distorted, then I will melt your face

. So, I did things ass-backwards

... I'm currently correcting this as I'm now in a classic-rock phase (which is what buying a diverse Marshall can do to you...)
SO!!! Learn your chords .. seriously, walk before you run. From Sultans of Swing: "Check out Guitar George .... he knows all the chords.." Yeah, be THAT guy! Then, take the simple minor scale and learn to alternate pick duples and triplets .. alternate picking triplets is difficult to master - do it, though, and you'll be in good shape .. then go blast away at The Four Horsemen

Finally, learn the pentatonic and blues scales and learn to make that guitar sing. Add more scales and whatever seasoning and have a ball.
--Sean
P.S. There's nothing wrong with playing "stupid simple" stuff. As soon as I struck a root-5th power chord for the first time and realized it sounded like Metallica, I played nothing but For Whom The Bell Tolls and Enter Sandman for weeks on end .... only the rhythms, though. Y'know, I still haven't gone back to those to do the leads. Hmmmmmm..