Bb (B flat major)
Am (A minor)
F (F major)
F major is the key. Quite regular chords, but Bb and F not to be played easily for a beginner. You can transpose the song into C major, thus, use the chords
F (F major)
Em (E minor)
C (C major)
This will be easier to play; use only the 4 higher strings for the F chord.
See http://chordfind.com or your favourite chords website how play these chords.
Good luck,
Tosta