You will not need to worm your chicks as they have had no chance to get worms in your brooder.  
 
I personally have never wormed my chickens and they are all very fat, healthy and lay lots of eggs.  I don't like to use any medicine, unless its really necessary as I don't like chemicals in my food.  
 
If you only have this small group of chicks, and no adults birds, then you probably will never need to worm them.  I recommend keeping the coop and run dry and then any worms from wild bird droppings will not be able to survive anyway.
 
Its up to you, but I would save time and money and leave it to nature. Research has found that actually having a few parasites boost the birds immune system.   If your chickens every get worms you will see the egg production decline, the birds loosing weight, etc, and they its really easy to worm them.