Hi and welcome to the DIS!
You picked a good time to visit in that the parks will be relatively empty for your first trip.
If you look on this board and all around the DIS boards, you will find many threads that will help you navigate your way around WDW. I'm sure you will pick up many dos and dont's from these boards!
It would be easier to answer your questions if you could be more specific. Otherwise I suggest you take your time and look through these boards to pick up advice from all the DIS veterans!
Have fun!
Bob