You can begin reading about
Carpentry, as it is the one most likely you'll use if you want to make add-ons.
Blacksmithy is a natural companion of carpentry, and very useful by itself too. While training Blacksmithy, having some
mining is very useful, since you can smelt what you craft for better ingot returns depending on your mining skill (the higher the better, obviously). Other skills that go well with carpentry are
tinkering so you can make lock boxes and traps, as well as ovens and other add-ons;
tailoring for spinning wheels and looms, and tailoring is pretty profitable all by itself too; and to a lesser extent
magery since this will only allow you to make pentagrams and abbatoirs. Musicianship is not really worth it since not too many people want GM instruments, when a newbied one (widely available) works just as well, and will stay with you forever.
Other useful crafting skills include
alchemy, which many people use together with
poisoning. That basically only leaves
inscription and
fletching as the other two useful crafting skills.
Most people tend to have a gatherer and a crafter in different accounts, that way, you have a guy with mining, lumberjacking in one acct (who can gather resources, and smelt all your macroed weps and armor), and a pure crafter in another with blacksmithy, carpentry, tinkering, magery, tailoring, alchemy and inscription.
Play with them, find which template suits you best, and good luck!!