My two best lucid dreams ever both had one thing in common. I took them slowly and was able to remain extremely calm. Other than a little telekinesis,( I was playing with some dishes, levitating them and such) I stuck to the norm. I used a computer, and went for a walk along. This seemed to greatly prolong them as well as keeping them extremely vivid and clear. I'd say to keep it simple at first. Simple dreams have a pretty awesome potential.