Well... I know one of the first songs I learned when I first started playing was "Stone in Love" from Journey. (Hell I think I am giving away my age now). You could learn just about any song from Warrant since they basically stuck to like 3 chords. AC/DC is ALWAYS worth learning. They have some great timeless songs, mostly 3 chords and mostly in the open position...

The top 5 songs I learned when starting guitar:
1. Stone in Love- Journey
2. Rock You Like a Hurricane- The Scorpions
3. Tobacco Road- David Lee Roth
4. Alone Again- Dokken
5. Runnin' with the Devil- Van Halen