You use a Halberd. Normally for you it would be 1d20+5 for the attack and 1d10+4 for a normal attack or 1d10+6 for using it two handed.

If you declare a power attack, then it would be 1d20+4 for the attack and 1d10+6 for the normal attack and 1d10+9 for using it two handed.

Yeah, Fighters start out being damage beasts :p