Here are a couple of suggestions: try Barnes and Noble or Borders.com and look for a book called "Making 3d Games" or something like that. I read it one time while I was there, and it helped a lot. Also, look at cliffy b's website (not the one on PU) for some mapping "commandments" to keep in mind when building a map. However, without a doubt the best thing to do is PRACTICE, PRACTICE, and PRACTICE more...oh yeah, and read lots of reviews at Nalicity; they tell you what not to do! Good luck.