What I would look for would be this:
Clear, bright looking eyes
Clean, shiny feathers
Solid and moderately plump (not scrawny or fat)
No runny or snotty noses, goopy eyes, or discharges (other than normal droppings) from the vent
Active and curious
Good yellow color to the skin.
At the ages you'll be looking at their combs will be still smallish and undeveloped without a lot of color to them. Unless they are roosters then they'll have larger combs than the rest.
Ask what they have been feeding. Quality chick starter will help to produce quality birds.
Clear, bright looking eyes
Clean, shiny feathers
Solid and moderately plump (not scrawny or fat)
No runny or snotty noses, goopy eyes, or discharges (other than normal droppings) from the vent
Active and curious
Good yellow color to the skin.
At the ages you'll be looking at their combs will be still smallish and undeveloped without a lot of color to them. Unless they are roosters then they'll have larger combs than the rest.
Ask what they have been feeding. Quality chick starter will help to produce quality birds.