About three weeks ago I decided I wanted to do the same thing as you. Fortunately for me there is a Tandy leather store not far from work. I picked up a sewing awl for stitching, an overstitch wheel system for marking the stitching pattern, a thonging chisel set for punching the holes for sewing, a rivet setter, and an eyelet setter. I also bought a cheap rotary punch from the local hobby store but it failed after only a few uses so I'm looking for a more heavy-duty one now. Also next on the list are the diamond hole punch mentioned above, some sharp leather shears, and a bunch of different stamps so I can decorate the stuff I make.
So far I've made a couple of string keepers, a bow limb tip protector, an arm guard, and a finger tab. I just look on the internet to get ideas for patterns and try to make the stuff myself. The next thing I'm going to make is a back quiver.
I also found a pretty good website for getting leather, laces, hardware, etc ... brettunsvillage.com. I bought a side of leather for $75 and it should be plenty to make a couple of back quivers, arm guards, and more finger tabs. I also got a bundle of 10 leather laces that are 6ft long, a gross of hand sewing threads, and a package of rivets. All the prices seemed pretty reasonable, and the best part is they offer free shipping.
Hope this helps in your endeavor!