I've got a bunch, honestly they're all basically the same so once you get one you can make little changes to make it fit others. As stated earlier you want nice stiff 8-10 oz for the actual holster (I like the same for the belt as well but use different leather that isn't as stiff), around a 4 oz for bullet loops. There's a couple of different ways of doing bullet loops which is a long explanation right now. You can do pretty much a entire holster rig with rivets as well if sewing isn't your thing, except for the actual holster. Best way to save your fingers there is prepunch your holes using a awl, laying it down with a plastic cutting board behind it is a good idea. Then do a saddle stitch through it, strongest way of stitching it and will save your fingers. Keep your awl sharp as well. If your needle doesn't come through nicely you can use a small pair of pliers to push or pull it through.
Best advice I'll give you though is stay away from Tandy's, poor quality and hugely over priced.