This would be my favorite build for flammy. Unless you're not going to retire on lvl 31, then I'd suggest 21/21. You need ath to be able to use the range properly. With some footwork you can easily land an easy hit after another by just walking back and forth on group fights without ever going inside the enemy's attack range. Also, against cav that sword is great. Jump out the cav's way and give them a nice swing to the face. Once again you need to be able to move fast to do this.
Level 30 (4 420 577 xp)
Strength: 18
Agility: 21
Hit points: 63
Skills to attributes: 8
Ironflesh: 5
Power Strike: 6
Athletics: 7
Weapon Master: 5
Two Handed: 148