You should get in touch with the suppliers on the sponsor pages. The list of tools you need will vary with the opinion of the person telling you. If you are just getting started I would start with a basic set and get the best tool value possible. For sure with stitching you would need a good awl, and thread and needles. Get good ones as the cheap stuff will disappoint you. You will also need a rivet setting tool and a snap setter in addition to the snaps and rivets. As far as stamping tools, you can start with the cheaper Tandy stuff or go all the way to the Barry King tools or Bob Beard or Clay Miller to name a few. They are quality tools and will cost significantly more, but, you get what you pay for!! Also with leather.........there is good stuff like Wickett and Craig or Herman Oak all the way to other nonusable leather form some others, again, you get what you pay for.............just my 1 1/2 cents worth.
Mike