It all comes down to this, how far and intricately are you going to dress this deer. Is it just a field dress or are you totally processing and skinning and butchering the deer.
Also how good do you want to do the job?
There are many decisions you could make based on the answers to those questions.
I have never dressed a deer. I am a butcher by trade though not got tons of experience but have done lots of research into what knive are used for what.
I have to give a nod to razor in that he reccomended that you get you some good professional grade cutlery for this job. Victorinox is a great brand but there are others that may be cheaper or more expensive. Dexter Russel, F. Dick, Cozzini and others are all just about as good as others. Ontario Knives makes a line called Old Hickory which is made of carbon steel which requires careful oiling and storage to prevent rust until you get a patina on it. It comes with a really dull edge in my experience and I think that is so you can put your own edge on it. I mention this for two reasons, they sell a 5 piece package that runs between 15 and 30$ depending on where you get it. Pair that with a skinning knife (which they also sell) and a bone saw (optional but makes things easier sometimes) and you have a pretty good kit that will fit in your hunting pack. The other reason I mentioned it is because you mentioned that you needed to learn to sharpen, these are great learning to sharpen on knives. I was good at sharpening before I got mine and am better after having to spend time with those knives on a stone and a sharpmaker. Onece you learn to sharpen those, you will be able to sharpen just about any knife. You can find them at www.ontarioknife.com
if you think that the knives look cheap, its because they are. They are low carbon steel and a cheap but sturdy wood handle with brass rivets. Meant and bones. Once you get them sharp, they with cut for a lifetime and if you loose one, its not a big deal because of the price. People may knock them but for the money they are a great learning to sharpen knife and they have been made in america for over 100 years so they have a track record that you can't sneeze at. They aren't really a belt knife though, you should get knife roll or case that fits in your pack. For a good hunting belt knife, a buck vanguard is a good design and they make one that has a gut hook, so that's a good option too. I own meat knives from several companies and they all work about the same if you take care of them and learn to use them. Another good tool would be a good butchers steel. You don't have to spend much on one, even most of the good ones are in the 10-50$ range but you can spend more. A good rule on length is to get one that is as long as the longest knife you are going to usually use with it. That way you don't have a huge steel to figure out how to pack and end up leaving it at home. You can sharpen long knives on short steels and shot ones on a long steel, so go with what you can carry. Learn to use it while you are learning to sharpen. Its not "hard" but you have to get the feel for it in my experience. Take a sharp knife and cut a bunch of chicken breasts into strips until it starts to drag just a little and the put it on the steel and figure out just how to put the edge back on. There are different types of steels but just a basic medium staight cut is most likely what you will get if you go to a restraunt supply store. I would avoid the polished steels, they are for extremely fine edges that you probably won't need and they are a little harder to use. I hope this has been helpful, pm me if you need anymore suggestions.