Crafting
Who can craft:
Spellcraft: Healers, Runemasters, Shamans, Spiritmasters
Alchemy: Hunters, Shadowblades, Skalds, Thanes
Weaponcraft: Beserkers, Thanes, Warriors, Skalds
Armorcraft: Beserkers, Thanes, Warriors, Skalds
Tailoring: Shadowblades, Hunters
Fletching: Hunters
Getting Started:
Goto Jordheim and talk to a "master" - for weaponcraft  talk to the Weaponcraft Master
Most "masters" can be found near the upper forge or by the vault.
Drag your skill to the hotbar.  For some items you may need to drag other skills like Metalworking.
For example:  To make a bronze dagger you need 3 skills up 
Metalworking - to make the bronze blade
Leatherworking - to make the leather hilt
Weaponcraft - to combine the blade and hilt to make the dagger
Buy components - see Ereck near the forge (he has multiple pages of stuff - click the arrows)
Goto a forge or alchemy table and start making neat stuff.(alchemy table is near the vault)

 
Basic Facts:
You can only have one primary skill - you cannot change this once you decide.
Secondary skills go up as follows:
Spellcraft/Alchemy - 45% of your primary skill
All others - 66% of your primary skill
In general I recommend you focus on raising just your primary skill.
Try making items that are oj/yellow/blue - yellows are the best to craft to raise your skill the fastest.
Type "/webdisplay trades on" so your skills will show up on our members page.