Post by Maelwys
I'm not going to rate it, since everyone is new at some point, but here's how you go about fixing it.
1) Gear for agility, stamina, and attack power. Strength is a bit wasted on rogues.
2) Spec
http://www.wowhead.com/?talent#fZMxNz0chqru0xo Combat should use the glyphs of sinister strike and either slice and dice, garrote, or eviscerate. Open with garrote, hit slice and dice, SS to 4-5cp and Eviscerate.
You're speccing for Backstab, there's a few problems with this. One, it is poorly done. You want Puncturing Wounds and Improved Gouge for one, something like
http://www.wowhead.com/?talent#fGxf0xMoiZhZxb-ish. The combat build is much stronger, includes more avoidance talents and doesn't require the positioning requirement of backstab. The Backstab build should use gouge and probably eviscerate. The backstab glyph is nifty, but requires you to use rupture, which will break your gouge (your primary positioning). Gouge in the backstab build becomes your primary positioning attack, meaning you'll gouge, pool energy, and then backstab. If you pool energy and backstab at the last moment, you should only be taking hits for 3-4 seconds. Two options here. Cheap Shot, Backstab, Eviscerate (if 4cp), Gouge, pool, Backstab. The other is Ambush, Gouge, pool, Backstab, Eviscerate.
3) If you're desperate to use daggers, stay the course until 50 and respec
http://www.wowhead.com/?talent#fGecoxMoiboGz which aims to be
http://www.wowhead.com/?talent#fGecoxMoiboGzZ0xZxb in due time. Mutilate is a strong leveling build, but using two daggers means you might have trouble finding a pair of weapons. Combat can spec to whatever weapon you're using, and swords are more than abundant. Assassination will use the glyph of mutilate and either slice and dice, evasion, or eviscerate. Open with Garrote, slice and dice, mutilate, eviscerate (if 4cp, other one more mutilate, then evis).
4) Always opt for a slow main-hand and fast off-hand, use wound poison on both weapons.