Like you, I'm new to leather work. I just finished my first holster. Not great, but it'll keep me from stuffing a gun in my waistebelt. You can usually find deals at Tandy on leather. Right now, they have Oak Leaf Double Shoulders 8-9oz for $4.99. That's what I used.
Of the tools you listed, I never needed the freehand groover, beeswax (I had some but never needed it).
Of the tools/materials I used, but you didn't list, were a Dremel (an absolute necessity for me-drills,sands), pliars (for pulling needles through), ballpoint and sharpie for marking, brown Kraft paper for patterning (Walmart), foam brush for applying dye, Neetsfoot oil, and one very sharp Old Timer pocket knife.