There are several Superior Ovens in 'The hill', there is a Forge in Budgeford going up north towards Scary, all the crafting facilities can be found in Michel Delving, at the very western edge where it says 'to the far downs', a Forge, a woodcrafting table, a jeweler's I think, and possibly a tanning thing, can be found on the eastern edge of Bywater.
The first problem I found with crafting, was that I couldn't find my beginner recipes. To do so you have to go to your crafting panel and select, for instance, wood crafting and click the + next to 'apprentice' then you should get a list of recipes.
This is one of the more difficult professions, as you need to have someone else to be a Forester to make treated wood for you. But you can make bows, staffs, and lots of other things.
Tin is, it seems, rarer than copper. I, at first, thought that you could only get Barrow-Iron deposits in Bree-land but actually you can get it around Bridgefields to Brockenborings, you might get it further afield but I haven't gone that far yet. In the same area you can get silver deposits, but you can't make it into weapons, just jewellery, if you're a Jeweler.
You can make daggers, great swords, swords, and for ranged weapons, throwing axes. When you become a weaponcrafter you get the ore tracking skill which shows you where nearby ores are on the little circular map in the corner. In the Shire, in Michel Delving, there is a big crafting area with a crafting guild hall, and a guild master, as well as traders you can sell the stuff you make to, just at the very edge of the map. There is also a smaller crafting area with a oven and a forge somewhere near Hobbiton. Iron weapons you can only use at level 14, so rather than making the Barrow-Iron into weapons leave it as Ingots or ore if you are a way below 14, but you could sell some.