Key of A Major!
Warmup: Long notes in A Major, 2 octaves, looking for the most resonant and beautiful tone for each note.
Tuning: Major triads along the A Major scale, with your tuner providing a drone on the tonic of each chord. My favorite all-purpose temperament is currently 1/6 comma meantone. Valotti also work, and equalt temperament if you don't have other options.
Etude: Hotteterre, L’Art de Preluder Op. 7, p. 8 (at the bottom)-9. Warning: this is in French violin clef!
Benda Concerto in A Major, First movement: http://imslp.org/wiki/Flute_Concerto_in_A_major,_L2.15_(Benda,_Franz)
Bach: Sonata in A Major, BWV 1032, 3rd movement, Allegro: http://imslp.org/wiki/Flute_Sonata_in_A_major,_BWV_1032_(Bach,_Johann_Sebastian)