AMEX - Good advise. I would just add -
KEEP THE NOSE DOWN. Assuming obstructions are not an immediate problem just be glad to get the plane in the air and stabilise your speed before attempting the climb out. As Amex said a VERY GENTLE hand with the flap removal.
The opposite exercise is the landing. With my new pilots I always give them the following test on the check ride.Dirt Strip. Full load.
Full Flap approach. 10 ft above touch down Yell (and I mean yell) " Game on the runway".
Most are good on the power application but never hold the nose down enough. Then revert back to the take off proceedure as above.
Good luck and enjoy Namibia