The internet can be a wealth of information for all manner of stuff.
When I lived in bush AK, the native women of the village put on a skin sewing class that I decided to attend. The charge was nominal for the required needles and other material. We had the choice of sewing either mukluks or a fur hat. Fron the patterns they provided, we cut out with a single edge razor blade, the pieces to be sewn together. The needles were a variety of fairly thick straight and curved needles. We didn't use an awl or leather hole punches and although in some areas of the hair on leather we were sewing, it took a bit of effort to punch through, but the needles worked fine! They had us sew the pieces together with waxed dental floss, which was, for the most part hidden since we sewed the edges together from the inside out, I sewed up a pair of mukluks and for the oogruk soles, I had one of the native ladies sew those on for me. And although I seldom wear the mukluks, they're still holding together fine with the waxed dental floss stitching.
If you're going to hand stitch a leather case, my suggestion is to practice hand stitching to ensure your stitching is even for width and depth. The needles and all other materials can probably be found at about any craft store/leather shop, as has been suggested and it's easy to hand cut the leather with a good sharp single edge razor blade and a pattern and/or straight edge.
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