How rock do you want?
Poprocks and Coke by Greenday is easy "pop rock", as is Blister In The Sun by the Violent Femmes and Californication by Red Hot Chili Peppers (just learn the basic picking thing, not the runs and such for now).

TNT by AC/DC is an easy "hard rock" song. Some others would be things like Whole Lotta Love by Led Zeppelin, Smoke on the Water by Deep Purple and Walk This Way by Aerosmith.

Walk by Pantera is a very simple "metal" riff. If you want this kinda "rock", look into that, and maybe Enter Sandman by Metallica, some Motörhead, some Black Label Society and stuff like that.

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