Can you please help me flute problem?

The main melody is the one you should play, i.e. the right hand thing, NOT the accompaniment! Though I strongly warn you to NOT exceed your flute playing skills at this stage, ONLY try it with your flute teacher first (in case you don't take lessons I suggest you to start them NOW!)! If the melody goes lower than middle C then either get the sheet music transposed to a different key or wait until you can manage to play it one octave higher.