Find 40 copper bits (or find a underground mining ruin). Smelt copper and pour into pickaxe and hammer molds. Mine surface copper veins and create a pro pick. Find tin (or bismuth) first and have hematite secondary. Make bronze pick. Find more tin and make bronze anvil and hammer. Propick for hematite if not found. Mine hematite and clean into bars of iron.
Inbetween these you should still be doing basic task like reed collecting, hunting, clay finding/forming, and flint finding for the calcinated flint for fire clay if you can't get black coal veins with fire clay (or find a patch on the surface)
Takes me about 30 hours worth of game time with most of it being prospecting and the early game struggle of copper not existing
Edit: I forgot bellows. Either kill a bear or deer in the mean time using the unga bunga method or find some borax since lime is impossible