> G - Em - C - D7 - G - C - D7 - G
> G - D7 - Em - C - D7 - G - D7 - G
Here are the individual notes for each chord in the right hand:
> G: G-B-D
> Em: E-G-B
> C: C-E-G
> D7: D-F#-A-C
In the left hand, you can play the root notes of each chord in the bass:
> G: G (low)
> Em: E (low)
> C: C (low)
> D7: D (low)
Once you're comfortable with the basic chords, you can add some embellishments such as arpeggios, grace notes, and trills to make the song more expressive.