Azara's right on about your Talents.
Don't forget to enchant everything you can. You should be able to find some lower level enchants on the AH for a reasonable price.
For Reputation, Earthen Ring is usually a good place to start due to the amount of caster gear available for Shamans. Rustle put together a nice list for Rep Gear
, breaking down what you should grind for what gear.
If you really want to start looking closely at your gear and determine what you should do for Gems, Enchants, Reforges, etc. I've found Ask Mr Robot
to be helpful. It starts you in the right direction. For absolute max, then head over to Elitist Jerks - Shaman Forum
As far as Glyphs go, Primes should be Lava Burst, Lightning Bolt and Flame Shock.
Majors should be Lightning Shield (also works when you use Fulmination so it will only drop you down to 3 charges), Fire Nova is nice for packs when you have a Magma Totem out, and the last can usually be a personal choice. I took Healing Stream as that's what I normally drop as a Water Totem, and adding 195 resist to Nature, Fire and Frost can help the healer quite a bit.
Minors can also be a personal choice, but I do like Renew Life (no Ankh required) and Thunderstorm. I've never really liked pushback effects as it always seemed to launch the mobs into another group. Edited, Apr 11th 2011 9:02am by Jornam