Hi Nancy,
The piece is in the key of F with an occasional Eb and Db thrown in but as long as you tune your B, E, and D string to their flats you should be fine. Start the piece with the Bb and the E and D natural
You’ll find that the opening section moves between the chords of F major and A minor then it moves through a Bb and Eb chord. At the end of the first section you’ll need the Db for a moment.. Start by picking out ONLY the melody:
A C F G F E C etc. and you’ll soon find your way through the chords.
All the best,
Mark