My Suggestion is to Question
This is just a quick suggestion as to what to do if you become lucid tonight or any other night and have no idea what to do.Okay.
Your subconcious can only portray what it and you know about a certain 'thing'.To put it simply,let's say you saw you friend Adam eat an apple and say "I like apples",then he goes off and slaps a little girl.But you didn't see him slap the girl.
Whilst dreaming,your subconcious can only portray your perception of Adam as you know it unless you conciously alter it. I'm saying that if you were dreaming and you had a little girl and an apple on each side of your body,you'd most likely see Adam go and eat the apple instead of slapping the little girl,if you know what I mean.
So your subconcious cannot lie to you, unless simulating a scene etc.Because you are your subconcious, and you can't lie to yourself because you already know the answer.
This means you can ask your subconcious most questions that you have some understanding of and you will get an answer that is true to you, right?
On to the situation:
You're having a lucid dream and you decide to do something interesting and go to see the ultimate creator of the universe and everything that will and won't exist, and you ask him the one question,"who is your creator".
Seeing as you'll most likely get an answer that feels right to you, you'll most likely be satisfied.
I'd love to see what answers people get.
Sweet dreams,
Alex.