I can't get mana or make magic items. I also can't use demon skins and stuff to craft. Or craft items past tin. How were you able to do that? What server are you using?
Mana: Wander the surface until you find a Wizard selling either a Mana Jewel or a Wand. If Jewel, craft it with a stick at a bench, if Wand, craft a book. Use the wand on the book to get the Spellbook. Open the Spellbook and use the only available spell[Mana Acquirement I]to unlock mana, and set your max to 50. If you REALLY wanna craft your own, I don't honestly remember where you craft them at.
Metal Progression: Forge to craft Bars, 6 Cobblestone Walls+4 Coal, to craft with metals above Tin, you need an Anvil, which is 6 Cobblestone Walls+4 Iron at a Forge. Copper tools require String, and must be done at Stonebench next to Workbench. I honestly suggest simply finding a town that has a forge and an anvil and steal them, fairly certain you need at least Copper level to break it.
Demon Skin: Armor is crafted at a Forge+Tannery at the same time[Armor has set bonus that boosts your damage output, EXTREMELY powerful]. Demon Metal[1 Iron+3 Demon Leather] needs Alloy Smeltery[2 Forges, 26 Cobblestone Walls, 8 Coal, 4 Iron], Demon Metal tools are Iron+Tin+Demon Metal.
And I'm not on a server, don't even think there ARE servers.
Also, sorry for not responding anytime recently, don't check this website much.