My name is Thijmen, and i'm trying to get started with leatherworking. i'm mostly interested in making functional items. 
but i can't figure out where to buy tools and what tools i'll actually need. so far i have: 
a curved leather needle (half a circle) 
a knife that easily cuts through leather. 
a set of chisels and gouges 
hole puncher tongs 
i also read about needing a mallet but, would a clawhammer with a rubber cover do (with that cover it'd pretty much be a rubber mallet in function) 
things i think i still need: 
an edge beveler 
piercer 
something to make grooves in the leather 
a steel ruler 
a self healing cuttingboard 
a marble slab (i plan to get a marble cutting board) 
materials i have: 
2mm thick full grain leather which was supposed to cushion expensive couches. i have 2 garbage bags full of this mostly half skins. 
black thread suitable for leather (thats all i know about it) 
and a handful of buckles, buttons and similar things 
things i plan to make: 
wallets (seems like a good starting point) 
bags/backpacks (when i'm good enough) 
if i get good enough i also plan to make my own boots but that will wait untill i'm good enough in a few years 
the problems i have: 
is there anything i'm missing? 
and where should i buy tools. a steel ruler or a cutting board isn't hard to get but an edge beveler or groove maker is harder to find. 
thanks in advance