If you want to check out where I get my tools, leather, and chemicals from, please check out the below:
Leather, tools, and chemicals:
Pittards (leather only)
Goods Japan (tools mostly)
Also have a look on eBay for bargains. Remember though, things may not always be what they seem!
Ian Atkinson (very good youtube tutorials)
British Blades (lots of information on leatherwork, also concerning every aspect of custom knife making)