Best Crafting disciplines for Ranger?
It’s generally cheaper to buy a weapon than it is a full armor set, so I’d say Leatherworker. For your second, Chef is an easy and useful crafting discipline to level. Whatever you choose, you might want to consider the Crafting Starter Sets available from Laurel vendors for 3 Laurels. They’ll give you a bunch of materials to get you on your way.
Edit: If you want to do both Huntsman and Leatherworker, logging is a simple task and raw leather pieces are generally very cheap to purchase from the Trading Post. The only materials that will cost you are the fine materials, and to a much lesser extent, the cloth scraps.