Here are a few tips.
1) Rudder is primarily a roll control in ACM. Without going into all the aerodynamics of it, yawing the airplane will cause the airplane to roll in the same direction as the yaw so left rudder = left roll, right rudder = right roll. This is due to something called Dihedral effect if you want to look it up and gain a better understanding.
2) Try this little exercise. Take off and level off at 5k feet. Completely release the stick and fly the plane with your rudder. You'll find that it's fairly easy to fly the plane just using rudder inputs instead of ailerons. Go back to the stick and using it just for pitch control use your rudders to shoot some approaches, fly through hangars, do turns around radio masts, etc and you'll rapidly gain a good feel for them.
3) Since the rudder is primarily a roll control start using rudder, in concert with your ailerons every single time you turn and you'll find that your roll rates are greater and it's much easier to position your plane where you want it. Just remember to go left, use left stick and left rudder together.
4) When you get used to the pedals you'll also see there are a great many other uses including creating a sideslip to slow down quickly, fine tuning your gunnery and rudder reversals. You'll also need them for returning home after pulling both your 262's wingtips off and other sort of battle damage.
