It's not a stupid question at all. You can leave them in the incubator until they're fluffy. After that put them in a brooder (no, it doesn't have to be in the house as long as it's in a secure, draft-free coop or shed) with a heat lamp. I give mine enough space to get away from the heat if necessary. I don't worry too much about proper temps. I watch the chicks instead. If they're crowded under the light, it's not warm enough and you'll need to lower it a bit. If they're on the edges away from the light, it's too warm. Give them some water and starter feed, and they're good to go. They need bedding in the brooder, of course. I use straw because that's what we have. It works just fine. I can't advise on vaccinating because I have never done so. Hope this helps some. Just remember that chicken-keeping doesn't have to be complicated.