If you're going to be doing mostly deer skin, that makes things a bit different from working with vegtan cowhide. I like to use a rotary cutter but you can do all your cutting with a pair of shears or heavy scissors. Poke your holes with an awl and stitch with artificial sinew. Or just stitch everything with a glover's needle.
With vegetable tanned cowhide, it's going to be more complicated and it depends on what you're going to make. You may need things like a stitch groover, a good awl, a knife, harness needles, an overstitch wheel, edge bevelers, etc.. Probably need some sort of glue as well. Tandy has pretty much everything to get started and the tools are perfectly serviceable. As you move along in your journey, you'll probably want to upgrade your tools with those from Barry King, Weaver, Osborne, Douglas, Zack White, etc..
If you're going to make bags, I suggest Ken Scott's DVD. If you're going to make holsters, I suggest Chuck Burrows' DVD.
