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Go to the NetHack Home Page.
The general documentation Guidebook.txt and the processed man pages nethack.man and recover.man should provide an introduction to the game.
The sample config file called dot.nethackrc can be used by copying it to your home directory as .nethackrc and modifying it to your liking.
If you are running X11 copy the nh10.pdf and ibm.pdf font files from /usr/games/lib/nethackdir to a X11 fonts directory (such as /usr/X11/lib/X11/fonts/misc) and run "mkfontdir", then restart X windows to load them. Also consider putting NetHack.ad in /usr/X11/lib/X11/app-defaults or its contents in your .Xdefaults or .Xresources.