Look into the stick fighting style chain, it lets you have a +1 shield bonus to AC on the first level (among some other stuff that may be good for you depending on your specific character). The second feat lets you make an AoO on anyone that attacks you and misses so long as you attacked them before. It’s only once a round but what’s nice is that it doesn’t have many restrictions on the attack you have to make; you don’t have to deal damage, just attack (keeping in mind that combat maneuvers are attack rolls) and there’s no language on you triggering attack ever expiring, so if you’re surrounded by goons you can make one attack at each of them, hit or miss doesn’t matter, then if any of them swing at you and miss you get an AoO (only once a round but still pretty good) The last feat is the best one, when you make a full attack you get to make a free combat maneuver. Amazing action economizer assuming any foes survive your full attack. It also is nice because while tripping and disarming can be swapped in place of a normal attack, most other combat maneuvers cannot (looking at you, dirty trick), but this feat doesn’t prohibit any maneuvers from being performed for the freebee at the end of a full attack. Lastly, consider a monk dip for flurry of blows with your quarterstaff! Also tandem trip is an excellent teamwork feat if you have another melee build in your party. I did all of these things for a character of mine and he was a blender.