Treats for chicks! And taming
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mealworms work great for getting not so friendly chicks to become your best friends, you do need to have them on a chick grit prior to feeding them and don't over do it, it's easy to get carried away and feed them too many because they are so much fun to watch when they grab them and run wild trying to find a secluded spot to eat with every other chick chasing!!!
yes they are fine but again in moderation, they are high in fat content so don't over do it with them.
they need heat till they are fully feathered and/or acclimated to the current ambient temp. most chicks are feathered by 4-5 weeks of age and at that time they should be acclimated to around 70° they can then be fairly quickly adjusted to meet the normal temps of their environment as long as it's not an extreme temp change.