I've included the chord progression as well as suggested scales.
Am - Am - Am - Am - Am - Am - Am - Am
A Dorian.
Over the last 1 or 2 bars you can use D Harmonic Minor or Bb Melodic Minor to lead to the Dm.
Dm - Dm - Dm - Dm
D Dorian (A Aeolian)
F7 - F7
B Melodic Minor
E7 alt - E7alt
A Harmonic Minor or F Melodic Minor
Am - Am - Am - Am
A Dorian