If there day old Chicks I would out them on a Med Starter Crumble, then at about 8 Weeks or so I would put them on a Grower Pellet or a Flock Rasier either or. When they start to lay I would put them on a Layer Pellet.
As far as what brand feed, it depends on what is in your area, I would try to find Blue Seal if I was you if you wanted a Name Brand food or I would find a local Feed Mill and try out there house brand.
Really need more info when you post so we are not guessing. Good Luck.