You may need to go to the file nwn.ini in the game folder and add the line

Debug Mode=1 to the section under "Game Options". This can be done with Notepad or a similar text editor

Now while playing press ~ to get the console and type DebugMode 1 (case sensitive)

Now press ~ again and press the TAB key to get a list of debug commands. Press TAB again to scroll the commands. Now enter a code below. Some will simply say "success" after entering, others will say "Entered Target Mode" in which you must click on a character you want to apply the cheat to. Change the # sign to a corresponding number of your choice
dm_god Invincibility
GetLevel # Add
dm_givegold # Give Gold Amount #
SetCON # Make Constitution to #
SetWIS # Make Wisdom to #
SetINT # Make Intelligence to #
SetSTR # Make Strength to #
SetCHA # Make Charisma to #