Originally posted by slofish_00:

you need a forge/bronze to unlock the adze

you need 4 iron and 4 obsidian to make a tool shelf

you'll need the iron pickaxe to break obsidian which is found at high
altitude in the mountains

^^ what he said.

You can get to a level 4 Bench pretty quick but the Tool Shelf requires Mountain stuff and an Iron Pickaxe (unless you get creative with a Stone Golem).