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I did the Terramycin thing, too, but won't next time. The dose is a low maintenance dose, too low to do anything except create more antibiotic-resistant bugs! If they get sick, they'd need a much higher dose than what you're giving them, and if you keep them clean, dry, warm, fed and watered, they shouldn't get sick. That's a synopsis of what I was told when I asked the Forum the same question. 
As far as the food - you should NOT feed layer feed to chicks, among other things, it's far too high in calcium, which can cause serious problems. They will need the extra calcium when they start laying, to form egg shells, but not now. Someone else can tell you the exact composition of chick feed, but look carefully at the bag. It should say somewhere on there what age poultry it's for. Also, there are different formulas for different types of poultry and they are not always interchangeable. 
I get my feed at 
Tractor Supply, or Agway has it, too, but it should absloutely be feed that is formulated for chicks. There's starter/grower, and grower/finisher, and layer feed. They are different, for different nutritional needs at different ages. 
You will likely end up with 50-50 as far as gender, that's the natural ratio.