The first thing to buy is an Angra Manyuu, and Ahura Mazdah if you're well off.
Next thing is to get a hand of an Alligator Set. A +6 Alligator Set will work just as fine. Also, there are people doing Ifrit MVP that are giving away Ring of Resonance and Ring of Flame Lord for free so you might want to take note of that.
To complete your set, do Daily Hunting quest and try to get the Night/Day Ring and the lower headgears from the rewards shop. Once set, you can go farming or do MVP hunting.
For farming, you can try Thanatos F7 (Stone of Sage), MVP Room Loots, Moscovia F3 (Witherless Rose, Piece of Cake), Geffenia, etc.