Here is a 'N' gauge track site.
http://www.katousa.com/track-plans/n-plans.html
Take a look and then as John said design your own. The plans should give you some ideas as to which way you want to go. It is much more fun working out what you want. Took me 3 months to cone up with my layout. I also admit to using a few ideas from layouts I have seen but with my own twist to them. Good luck.