Question

how to prepare a model of use of windmill for pumping out water or generation.
model should be handy and thermocol not to be used

Answer 1

Simply you can use wood for making the base of the windmill and can use plastic or metal(sheet) propellers (usually a set of three wings) for making the windmill and use one DC Generator ( turbine) which will recharge the battery in the power station and that power will be used to run the water pump to pump the water out. (you can see the above photo)
This is a cool model for electricity generation as well as pumping out of water....!!

HOPE YOU WILL LIKE IT.