There is a thread going talking about some breakpoints you might want to hit for your halberd.
These are the damage boosts required to do certain things.
If your sidearm is the handgun, there are some other important ones, at a minimal boost to damage vs chaos or berserks, you will be able to oneshot chaos zerks with a headshot.
With a 7% boost i believe you can twoshot maulers in the body (infantry, chaos), not really that important on FK since you will probably save your handgun for specials, but useful on huntsman (bow&handgun).
You need like a 20% boost to oneshot hookrats with a headshot (skaven, monster), might not be worth it, but it’s the one special you won’t oneshot with a headshot otherwise.
Other than that, stamina is an important stat for the halberd, although i personally wouldn’t put it on the weapon itself, but on the necklace and take the aura talent that gives you a stam shield.
I personally run block cost reduction instead of the more common health on the necklace as a 2nd property, because i prefer to run natural bond, which doesn’t stack too well with high health (which makes it rater slow on Footknight, i do not recommend doing it).
For trinket, stamina recovery and curse resist are probably ideal for halberd+FK.
Some other weapons you might want to give a try if you get bored:
One handed mace (no shield)
2h hammer
The mace with it’s charged attack and the 2h hammer with it’s light both have the same damage as the overhead of the halberd (keep that in mind for breakpoints), giving you somewhat easier access to good anti-armor, at the cost of group clear and range. The mace stands somewhere inbetween the two against groups, if you can get a handle on it’s somewhat awkward combo. The 2h hammer, while definitely not doing the damage the halberd delivers on it’s sweep, performs a lot better in crowd control, allowing you to tank a difficult horde more easily, keep in mind though due to the lower damage, if you don’t have teammates helping you take them down, you might have the enemy stack up quite a bit.