I would say learn how to read tab, learn power chords, and just mess around with alternate picking and string bending. Since most music is based upon major and minor pentatonics I would learn those as well, all you nedd to know is a few shapes and ascend and descend to get the blood going. Then start learning some Nirvana like "come as you are" "smells like teen spirit" "Lithium", "December" by collective soul or go to Iron Man, Smoke on the water, Paranoid. Most classic rock is made up of a combination of chords and riffs within the same measure so I think these songs and ideas are simple enough and get you started with that. but it won't be easy people became superstars on these songs for a reason. But if you just want to learn the tunes well enough to sing along get a "Fake Book" and just strum along with them to your stereo