You can use the same amp.
You have to tell us what kind of music/songs you like. I believe the easiest songs are the ones you like the most. In my first year
i tried to learn The trooper from Iron Maiden. It's not the most difficult song but not the easiest either for a beginner.
I loved that song so much that i had the patience to practice it and play it fairly well even in the first year.
Good-easy songs to start with as far as metal is concerned are most songs of Iron Maiden and Metallica.