Make your own pattern by using a piece of cardboard, folding it, and placing the blade where you want it, then mark off enough room for the lacing/stitching holes and belt loop.
Add decorations and fringe as desired.
And if you don't want a smooth handle and can't figure out something simple like wrapping wetted leather around it and securing it by pulling it through a loop until tight and letting it dry hard, then get a couple of high-topped brass tacks and put them in place to give you a grip - three per side should do it.
This isn't rocket science - any Boy Scout can show you how, or you can look at your public library under 'Indian Crafts' to see numerous examples of simple leatherwork.
Scouts Out!