First, you should spec mutilate. Combat daggers is sub-par compared to Mutilate, right now.
Second, you need a lot more hit rating. The poison hit cap is 315, and I'm not saying you HAVE to have that much hit, but it definitely will help.
As for glyphs, I'm currently using HfB, Rupture, Mutilate. Dual spec isn't necessary unless you PvP a lot.
When it comes down to getting ready for raiding, you should run a lot of heroics. Heroic Gun'drak has a ring and pants in it that are upgrades for you personally. Download Atlas loot and check what instance will give you upgrades.
If you're going to be a raid leader, you really need to start researching strategies on the different bosses. Wowwiki has some literature that you can read, but tankspot.com has videos that you can watch.
Since you guys are just starting out, you will be going into Naxx, which isn't very hard. Make sure your officers/raid leaders have a basic knowledge of each class so they know what everyone should be doing in raids.
Good Luck, and if you need more help....ask Theo :P
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