Welcome to FSM Balashivo91. Good to have you join us here in the Armour Forum.
For your camo net, cut the gauze approximately the size that you want it and position it on the model. Then apply a mixture of 50 / 50 white glue and water and allow this to dry. Paint the netting your colour of choice, then dry brush it with a slightly lighter colour. I would then dust it with pastel chalks as I weather the rest of the vehicle.
Hope this helps a bit.
Happy Modelling and God Bless
Robert