1. Iron Man (Black Sabbath)
This is a great one for beginners - the song primarily uses a bunch of power chords slid around to different frets, combined with single note lead parts. The tempo is slow, so it should give you time to move around the fretboard. Tony Iommi's short solo is going to be too ambitious for the real beginner, but you might try playing parts of it at a slower tempo.
2. You Shook Me All Night Long (AC/DC)
As is the case with many AC/DC songs, "You Shook Me All Night Long" employs basic open chords and open-string riffs. Nothing too challenging in this great hard rock classic. Even the guitar solo should be conquerable for the novice, with some practice.
3. Smoke on the Water (Deep Purple)
This is one you are absolutely required to know - the good news is "Smoke on the Water" is simple to play. Just a few power chords, played at a relatively slow tempo. The solo is another matter, but feel free to take a whack at it. This is actually a great one for novice bands to play - the bass part is fairly simple but a lot of fun.
4. Breaking the Law (Judas Priest)
Again, heavy use of power chords here, with a moderate tempo. You'll need to practice your palm muting - a fundamental technique of heavy metal rhythm guitar - as there is a lot of that here (listen for it during the chorus, underneath Rob Halford singing "breaking the law... breaking the law"). Be sure to play these parts using all downstrokes.
5. We're Not Gonna Take It (Twisted Sister)
6. Rock And Roll All Nite (Kiss)
It might be a stretch to call this one "heavy metal" - the guitar part in particular reminds of something that might have been recorded by Faces - but it's got some great riffs worth learning. No solos or other tricky bits to learn here.
7. Back in Black (AC/DC)
Lots of open chords here - if you've learned your basic open chords, you'll be in good shape. The little riff in between chords might take some practice to get up to speed and in time - try slowing the whole song down, playing everything accurately, and then speeding it up little by little.