Terrahyd is right... There's a lot of really good information within the forums here. Given your interests in carving, stamping and coloring leather, I'd read up on properly casing the leather (for good carving and stamped impressions). Plus, learning about using Eco-Flo dyes and acrylic paint to color leather might also be useful. Finally, there have been quite a few patterns posted to give you some ideas.
Happy reading!