Learn the pentatonic minor scale, you can make it fit almost any piece of rock music. For the most basic way to catch what guitarists are doing, just watch for the lowest note they play, and play it.
But if you wanna impress to get the gig, just throw in a few wee show-off tricks. Stuff like a wee 12-fret slide or something.
Also, you could buy an EHX Big Muff distortion, they make the sound massive, but cover up a lot of mistakes
