Hi! I'm playing guitar for about a year and I've learned Stairway to Heaven, Nothin' else matters, thunderstruck etc. from tabs here.

But now, I wanna develop my ear ability to breakdown the songs myself. What all bands would be great to begin with(in increasing order of difficulty) if my final targets are bands like AC/DC, Led Zeppelin, Cream, Jimi Hendrix Experience, Rolling Stones, The Beatles, Nirvana(Classic Rock Stuff) etc.

Should definitely try Asking Alexandria. Their binary is so complex, you won't know the difference between the 0's and 1's being thrown at you.
Beatles all the way, pretty easy to learn and some nice songs.Here are some other good classic bands: Cheap Trick, Beach Boys, Whitesnake, Van Halen.