i've gone with the mw quarterstaff beofre, and recently got my hands on one again, so this gen ill be using it once more. I've only used it with high agi builds since, imo, the staffs speed is its greatest advantage - and if you combine that speed with high agi for movement speed, it enables you to get trough many players' defense.
Anyways, the stab is obviously the staffs most powerful attack, so i'd aim to use that pretty often - it also hits at point blank range without glancing as opposed to the sideswing - overhead is also nice for the headshots. When you're further away, the left and right swings can be effective too - i tend to always aim for the head though.
I also like wearing very lgiht gear as it increases the speed and people often underestimate you or think you're a peasant.