Hi, On undulating ground keep as much weight off the nosewheel as possible through the control column. On short finals use full flap and pin the correct speed as well as winding in a good dollop of aft trim.
More important is the takeoff on undulating strips. Watch for the aircraft becoming airbourne too soon at too low a speed especially in gusty conditions.
Keep the column well back and be prepared to play the pitch with the undulations ie read the ground in front.
On becoming airbourne especially if the speed is near the stall check forward to reduce the AOA until you have the correct climb speed then pitch for the climb.
Pace