With a hidden tang knife the tang goes through the center of the handle not to be seen. Opposed to a full tang knife whose tang is the actual size of the handle and you can see it all the way around the outside of the handle.
Step 1: Step 1
You will have to decide on the type of knife that you would like to fit your needs. Do you want this knife to be collectible or functional? After deciding that, you will need to chose the size of the blade that you want and the type of handle that will be used. How many parts do you want to make your knife out of? Do you want to use spacers? You also want to keep in mind what price range you would like to stay in while making these decisions.
After your plan is put together and organized, you will want to sketch out a design of the handle that you want to make.
*Just a Reminder. Make sure all of your parts are finished and polished to your desire before assembly. This will save you much grief when your blade is attached*