You might like to check out 'Status Quo type 12 bar' in E, it has very similar chords to what you already know E5, A5 and an additional B5.
If you can learn these two keys A and E, it won't be long before you can jam along to the majority of AC/DC material. You'll find it in Guitar tab on the index page.
If your not happy about Learning Tab, I will gladly explain it.
keep up the good work, I think you might be a ' natural '
Grambo