Bemmu over at NWScript.com has created a tutorial that will take you through creating a basic conversation with an attached script to give the PC Speaker some gold.
Tutorial level: very basic
Following along with this tutorial should only take a few minutes. The goal will be to create a new Neverwinter Nights 2 module with one creature in it that you can interact with to receive gold from it.
Click here to view the tutorial:
http://www.nwscript.com/how-to-make-an-npc-give-you-gold.php