I don't recommend Rocksmith because it isn't very accurate. I feel that the game's tuner is a little off and I've tried all three platforms it's available on. Honestly, it's fun but the current version doesn't actually teach you guitar because the scales and chords are presented in an arcadey way that doesn't promote actual learning. The minigames that are supposed to reinforce scale/chord progression memorization are too quick with a high difficulty curve that you pay more attention to the game and the colored strings as opposed to the actual scale/chord shapes.
Just look up some songs on UG and then get some scales and chord dictionaries or reference books. The "Learn Scales/Chords" books always suck.