I think the concern over carbon steel rusting is much overplayed on this forum. For centuries, sailors have carried carbon steel knives on ocean voyages, and their knives survived with reasonable care.
As written before, keep them clean and dry, just as you would any fine tool. Do not panic when they get wet, just wipe them off on something dry when you get the chance and you will be fine.
You should know that some carbon steels have a tendency to darken with age and use. This is a form of oxidation, but it is NOT rust. In fact, it helps prevent rust.
As for coatings to protect the blade; use something cheap and readily available. I like silicon cloth, too. However, that can of cheap oil that you have in a cupboard somewhere will work just fine. If you like to polish your blades (as I do) use a good car wax. If you want to get fancy, get hold of some Flitz Rifle Gun and Knife Wax, which is a little pricy, and not necessary, but very pretty.
When storing your knife, remove it from its sheath, if it has one. Moisture can condense inside a sheath and cause rust pits to form on the blade. By the way, this is possible with stainless steel blades, too.
Most important of all: enjoy your carbon steel knife! Carry it, use it, take it everywhere, and enjoy it, and don’t worry about rust, so long as you take the few, simple precautions above. WARNING: once you put a fine edge on your new carbon steel blade, and see how sharp it gets and how well it holds an edge, you might become a convert. Many do!