The first note played would be the bass since the melody has a rest on the first beat. While the low A keeps sounding you would play the second and third beat of the melody.
It is possible to have more than 2 lines of music, but the same rules as above would still be valid.
Once you have counted the beats of each melody line as in the above example, you can simplify it to the following version. Remember: notes that are written in a vertical line are supposed to be played at the same time.
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