Forgo sex?
Afar, Takeoff and Landing Data cards are simply calculations of aircraft performance, based on actual conditions at the time of arrival and departure. These cards are filled out using aircraft performance charts.
Any pilot flying transport category aircraft should be able to help him out with this; it's very straight-forward. It's the same information he should be filling out when he flies his Cessna 172 with a student...just for bigger airplanes, with a little more information. No different, otherwise.
See if he can get performance data for a particular large airplane, one he may be flying, and begin calculating performance under varying conditions. Fill in the boxes on the form; that's all there is to it. With the assistance of anybody flying any transport category airplane, he should have no difficulty.