Hey man! I'm pretty new to the site too. I myself need some good techniques but I have personally experienced (and read about) a couple of things you can do IN the dream to maintain lucidity.
The first thing that works about 50% for me, is yelling "Increase Lucidity!" in my dream. I know it sounds stupid, but it should work.
The second thing that I noticed will keep me in my dream about 99.99% of the time, is spinning.

I was in a lucid dream once where I could feel myself waking up only seconds after attaining lucidity and I guess out of something I read, I started spinning and I stayed lucid and proceeded to fly out of Chipotle. (Yes, I became lucid in a Chipotle burrito restaurant)

this advice is currently useless to me since my induction is very poor and it'll be pure luck if I can lucid dream.

If you DO happen to go lucid, in case you want to try doing some pretty BA stuff, (ex. shooting a fireball from your palm, making a dinosaur appear out of thin air)
Remember!
Don't try to use your body. Instead use your mind/imagination. I remember once I tried to fire bend (yes, from avatar) but I couldn't do anything. I later realized this is because I thought my HAND was in control of the fire, whereas in fact it is your own head.
This is why you may sooner or later realize that it is difficult to change the surroundings of your dream, since you must imagine it all to begin with.

Hope this helps :]