RE: dumb question
Welcome here, too.
Can't emphasize safety enough. Get a hunter education course. Remember that when you pull that trigger, you can never get that shot back. The slug is gone and will be doing what it's designed to do. I teach hunter ed and can tell you a lot of horror stories: shot the deer and the slug went through and killed another hunter; guy shot and killed his kid (shot at movement in bushes), then committed suicide; etc. etc.
Re: hanging deer, a day or two will suffice. The outside temperature should be 40 or below. Anything more than that, and I'm getting mine butchered right quick.
I tell the butcher I want those packages of tenderloins and backstrap labeled good. That's not meat you want in stew, it's way too tender and succulent for that!
Good luck.