From just sticks

Making firestarter and a big stick

Create by hitting against a rock

wooden saw blade

Knapping

Create mud by hitting loose dirt in water

Pottery

Making casts

Crafting a coal pile

Coal pile multiblock

Used to make pottery and melt copper in vessels

Coal pile gui

When fire icon shows use shift rightclick with firestarter to ignite the top

Copper saw

Used to make planks with stripped logs

Wooden hammer head

Copper hammer

Unchiseled primitive bloomery

Making primitive bloomery

Right click with a hammer

Broken bloomery

Break it to get wrought iron

Crafting table recipe

Granite anvil

Use a hammer on a granite block

Forging double copper ingots

Bricks recipe

Bloomery core

Bloomery intake

Bloomery multiblock finished

Cover all four sides with brick pillars

Bloomery gui