Learn to play the melody of this song with your right hand alone, then you can add the chords as written. You will need these chords; C, F, G7, D (with a black key as the middle tone) and E (with a black key in the middle).
Use correct fingering (the numbers between the treble and bass staves) and you will have a smooth melody.
This song is in a 3/4 time so you will use a waltz rhythm. Begin ver-r-ry slowly with a metronome speed of 60.
When you can play it well at that speed, then try it faster.