Correct, however there are shotguns that are accurate over 100 up to 150 yards. As for other gear, small set of binoculars would be good, some cover scent, other than that just look around in stores and test things.
It's not hard to learn how to field dress, there's a few videos on youtube if you search.
I find it easy to butcher the deer once I get it home, but I've been doing it for years even before I hunted, otherwise there are usually places that will process it for you.
Even as an expert you can expect a lot of outings without kills, which is the beauty of hunting in my opinion. Get to be out and appreciate nature, and you should definately know that you will not get a deer every time you hunt.