When you receive your blade it will be heavily coated in mineral oil (veterinarian grade which you can get at any feed store for about a fifth the price of the stuff you get at a hardware store, same stuff). I use mineral oil for shipping because it has a relatively low viscosity (i.e. it's sticky), will not damage or discolor natural materials (i.e. wood and bone), and ensures the oil is not rubbed off in shipping and makes it to you rust free. For this same reason it is also a good field maintenance oil. Any oil however will work in a pinch. Before storing your blades always be sure your blade is dry, salt free (i.e. free of fingerprints) and well oiled. Never store your blade long term in its leather sheath. Leather holds moisture and even if well oiled may cause your blade to rust. My preferred oil for use at home and for storage is Choji oil. If you haven't heard of Choji oil it is remarkable stuff. It is the oil of choice of the traditional Japanese sword-smith and has a micro-structure so fine it penetrates the metal over time and actually makes the blade more rust resistant, unlike other oils that are purely topical. Yes it is fairly pricy but with Choji oil a little goes a long way.
If you should ever have rust on your carbon steel blade there is no need to panic. Minor surface oxidation due to exposure to moisture can be buffed out with 0000 steel wool. While minor pitting may remain it has not compromised the structural integrity of your blade. The blade should then be cleaned with a solvent (acetone or the like), then a cleaner wax, and then oiled. If you are really concerned email me good pictures and I will advise on how best to proceed.
The majority of my handles are hardwoods. All of my wood handles (unless a customer specifically requests otherwise) are only treated with Birchwood Casey Tru-oil (gun stock finish). Which can be purchased at Midway, Natchez, and maybe your local gun store. I use Tru-oil oil instead of a wax finish because of it is penetrating and durable, grain deepening, and non-yellowing.
For maintenance purposes I suggest just as on the blade that you occasionally wipe the handle down with mineral oil.