Around level 30, I'd recommend:
*Note, at 30, until you unlock viper bite, I recommend sword (centurion's sword). SA Fastblade is great.
Weapon 1: Thug's Jambiya (20k) or Merc. Captain's Kukri (11k)
Weapon 2: Merc. Captain's Kukri (CP item) or 11k
Ranged: Some form of marksmanship should be your choice. Fast and can use acid bolts to lower defense of mobs, always nice.
Head: Empress Hairpin (very easy to camp and high drop rate. Definatly something to work for. PM me if you'd like info on how to camp)
or Merc Captain's Headgear (9.5k)
Body: Merc. Captain's Doublet (10k - yes, I know it's ugly ;
Hands: Battle Gloves (18k). Easy to farm a key and pick the lock in King Ramp's Tomb. Almost always inside the chests here.
Legs: Noct Brais (9k) or Noct Brais +1 (13k). I'd opt for the HQ, only cause it does last you a while
Feet: Savage Gaiters. These are the mithra RSE and have a nice STR+3 on them. Fairly easy quest to get these.
or Noct GaitersNQ/+1
Rings: Balance Rings x2 (18k)
Back: Nomad's Mantle (9k)
Earrings: Beetle Earrings NQ/+1
Waist: Merc. Captain's Belt
As a THF, you've absolutely picked the best race so there's a plus. You focus wants to be dex/agi for weaponskills. The above gear isn't too pricey and wouldn't take you too long to farm up, I don't think. A lot of it has a few cheaper alternatives and quests to obtain them / conquest points.
I will mention one thing though, as you get higher, and even now, there are ways to improve your THF a good bit. THF is macro intensive, you'll need to make plenty of them. Personally, these:
TP Set: Here I'm striving for accuracy/haste/attack.
WS Set: A balance of everything comes in to play here. At your level, you won't be able to get anything other than DEX/AGI really to boost it.
Viper Bite is also stregnthed by attack, but I do not believe you can get too much attack+ at your stage. No need to focus on acc for weaponskills because SA/TA is going to make it hit anyway.
When you get
Dancing Edge, our best multihit, your focus changes some. Your prime concern becomes accuracy/dex/str/attack/emnity.
Evasion Set: I focus on evasion while not suffering too much on my attack/haste/acc because I hate killing slow.
Sneak/Trick Attack Set: A quick macro I do to add DEX/AGI as I'm about to land a sneak or trick attack.
All these swap gear, and usually the macro looks something like:
/equip Body "Merc. Captain's Doublet" <me>
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Gl, if you have any questions I'd be happy to answer! I hope you found this helpful.