Recently got my Barb Shammy to 24, i had the luxery of twinking him out early. Shammies don't really get fully functional until 34, but at 29 you get all the spells for being a group asset: Haste, Buffs, Slows, Regen, Good heal. To become independent, first you need to make some plat, doing the wisps is fine, but you can also do the disease pelt quest in Qeynos hills to make some nice loot.
Once you get some plat i would work on becoming a master smith, then you can make yourself a banded suit. Killing wisps is a good way to make plat, another way is to kill the bandits in WK and do the sash turn in. Anyways, once you make it to 24 and get some decent spells, you can get into groups or keep soloing till 34, when you get your pet and can solo all the time if you want.
Wisdom gear is not hard to come by, when you make enough plat, you can head to EC and upgrade yourslef. Good luck out there.
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"The joy of nostalgia comes from whacking mobs, then running like a little girl when I'm about to die"
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