sakimoto,
Your work is pretty damned good, if you ask me! Your blades show aesthetically pleasing forms, and you've taken some care in your workmanship, that's clear! You've made a few things there that I cannot make in my forge (specifically the sword, due to lack of sufficient forge length for heat treating....and sufficient quench tank for quenching....)
The wooden sheaths are actually pretty easy to make. I select a piece of wood I'd like to use (the dagger's in oak, from the local big-box store), cut out a blank bigger than I need by about 1/2" in all dimensions except thickness (only about 1/8" over on thickness) and rip it in half on the tablesaw with a GOOD blade (the rip cut will be the glue joint, and if the blade's good, it'll be almost invisible). Then I simply trace the outline of the blade, and go at it with a dremel and drum sander, hollowing both sides for the blade. I'll use a caliper depth gauge to cut a groove as deep as half the blade thickness down the centerline, and then feather out to the edges.... If you're careful, you can get a REALLY good tight fit, with no mechanical blade retainers needed... Lots of sand, hold together and test fit (in final stages, light clamping in a vice will help you judge "glued up fit")
Once the cavity is done, I cut a nearly final outline with my bandsaw, leaving about 1/4"-3/8" glue margin around the blade cutout...) This is easiest to do before glueing....
Now, glue the halves together. Clamp well and allow to dry to ensure a nice looking joint. I use cabinet maker's glue. Shape the outside with the tools of your choice, I often use a drum sander in the drillpress for roughing out shapes. Be careful not to sand into the blade cavity...
Sand ad-nausium, and apply the finish of your choice. I use linseed oil mostly.
The markings on the dagger blade (look like waterdroplets) are an accident, a result of me screwing up a forge basic. I blew the fire too agressively while heating for hardening the blade, and added more air to the fire than it could consume. The free oxygen in the airstream (which if I'm doing my part is all consumed by the fire before it reaches the blade) actually burned the steel, like an oxy-acetylene cutting torch, leaving that pattern. The "water drops" are actually places where the oxide scale coating protected the steel from the oxygen. I'll admit it looks REALLY cool, but it was an error. Many of my early knives show it, nothing recent does.
The single best place to start gaining forgeing knowledge is the book I referenced above, "The Art of Blacksmithing" by Beale. Also, Tim Lively's knife making tutorials, available online... Google his name. He also has a workable forge design (what I use, actually) for use with charcoal.
I sorta feel that we're pushing you towards forgeing, but realize that many knife makers DO NOT forge. Many are simply doing stock reduction, like you, and there's nothing wrong with that. You COULD stock reduce your blades, and then have them heat treated professionally by a local machine shop. There is great validity in that approach. I live in the middle of nowhere, and my neighbours don't mind hours of hammer strikes.... In suburbia, that may not be the case! You're doing great work with the skills you already have, and there's alot of refinement you can still persue before you need to head out to the fire. 'Course, it's a really enjoyable passtime too, so if it's what ya want to do (and I can't imagine not wanting to forge!), go for it!
As John pointed out, do take care with these blades. They carry a responsibility of ownership not unlike a firearm, and are just as deadly in close quarters. This is only amplified when, like me, you can't own a blade that ain't really sharp! That dagger will chop down 1.5" alders in a single swing.... Definately NOT toys!
J