My tactics with Greece/Macedonian armies:

1) Phalanx in the center
2) phalanx in the front and behind the line
3) Phalanx at the flanks, but usually the best pikemen only, who can hold flanks with ease.
4) Phalanx everywhere

Battle plan: March forward with my forest of pikes
Try to move in the way to outmaneuver the enemy's phalanxes and gain victory. Hellenic warfere rocks!