Welcome to the Cantina Verzejd. First khuk? If you don't mind, here's some free advice (worth every penny dont'cha know

). E-mail Uncle Bill and ask if he's still doing a two for the price of one deal on 15" AKs, if he is GO FOR IT! As soon as you get 'em look 'em over good and pick out the nicest one (it's going to be a tough choice, they're all great knives, but one will no doubt sing to you louder than the other). Clean all the WD-40 off the blade, oil it up with mineral oil, and put it aside for safekeeping for the time being. Take the other one to the kitchen sink and use one of them green scrubbing pads (Scotchbrite) to scuff up every bit of the mirror shine on the blade until it's more of a satin finish. Why? Because now that it's sorta pre-scratched up you don't have to worry about babying it do you? Do this BEFORE you sharpen it, and even then be careful. Now, read the FAQ on sharpening, make sure you understand everything, and if you don't, then be sure and ask, you'll find plenty help here on the forum.
Okay, sharp and squared away, now it's time for Khuk Practice 101
1. Find a comfortable carry position. Experiment, find the place on your belt or web gear where it feels best, then wear it around the house for a full day while you go about normal activities. If it's not in the right spot it'll let you know, adjust and try it again.
2. Practice drawing and re-sheathing the khukuri safely and efficiently. Start very, very, slowly, speed will progress with practice. Practice, practice, and practice some more, until you can do it blindfolded. The goal is to develop what's called "muscle memory". Example, when you walk into a dark room in your house, your hand reaches over and flips the light switch. If you've been living there for any length of time you didn't have to stop and think about where the light switch was, and chances are you didn't spend a whole lot of time fumbling around for it. That's the kind of familiarity you should be striving for with your khuk. The simple act of drawing and resheathing your khukuri is one of the most important things to learn, and sadly enough a lot of people just breeze through it so they can get on to the chopping and fancy swinging. Hypothetically speaking, you can be a purple polka dot belt, Nth degree ninja master, in the art of hung chow (old GI term for constipation

) and still wind up dead because you were fumbling around trying to clear your weapon from the scabbard.
3. Put away all the knives in your house and use the khukuri to cut everything that needs to be cut, no matter how large or small. Seriously, use it, and it exclusively, to cut up meat/vegetables, open packages, prune/trim shrubs, trees, weeds, etc.. Your learning curve/comfort level will shoot straight up. Far faster than if you just pulled it out, took a few whacks at a log, and put it away. By putting it through a variety of tasks you'll learn much about it's handling and capabilities, in a "real world" environment.
Good luck, enjoy your first khuk, and be safe.
Sarge