Dont forget to use food while you level also. Always, always always use food. At your level , if your missing alot you can use Jack O lanterns which have +10accuracy and +10evasion. I used them alot during the lower levels and each one will last you 3 hours, not bad at all.
As mentioned by the others above, sword will be your highest dmg Weapon skill for a while. (Sneak attack+ Fast Blade) But try to keep your daggers capped as much as possible. After level 33 you will be using daggers for the rest of your Thief career usually. Good luck on Thief, its an amazing job, and one of my favorites by far. :)
75WAR 75BRD(merit) 75THF (main)
Subs: 42DRK 45NIN 42SAM41RNG
77 SAM MNK PLD 75 WAR RNG NIN
Subs: 37DNC 37THF
Born on Dec. 27th, 2003, Kujata R.I.P.