if the search function doesn't work, just expand your potential view to be 50ish long, and start scrolling back. somewhere between now and january, there was a couple threads, one massive, on preserving handles with various kinds of things like tru oil, tung oil, danish, mineral, etc.
as for the steel - so far i just user mineral oil. picked up a couple bottles for $2. wipe your blade CLEAN of all finger prints/oils, etc with a clean cloth, sometimes i'll use a light metal polish or a 3m scotch bright if the blade was in use, if any rust, remove it (very fine grit sand paper/scotch bright, note: this removes your mirror finish if you have one, gives you the satin finish many prefer). clean blade? put a couple drops on a cloth, wipe it on all the metal bits, including bolster, butt cap. now, don't neglect the karda and chakma either, or the sheath.
leather needs love to - i've found that the "black" comes off when wet. still researching ways to protect that stuff. i have no idea how they even tan it, so depending on use, certain products can't be used on some tanned processes is my understanding. i'm guessing silicone or wax would be no problem though. guys? perhaps someone has sheath scraps laying about we can practice on.
bladite