First of all, well done on the lucid! Each one is progress.

Secondly, when you become aware that you are dreaming you should try to remain calm, getting excited will only wake you up. Take deep breaths then rub your hands together. If you feel the dream fading, you can always shout "CLEAR!". Like Robot_Butler said, you should try and touch a few things and explore the dreamscape.

How everything helps! Good luck and see you around.