I've never used it in a serious game and can't even remember using it in a blitz game. Just type "Dunst Opening" into a search engine, here's a few of the many hits I got:
https://en.wikipedia.org/wiki/Dunst_Opening
https://www.youtube.com/watch?v=IAWxUtpPT8M
http://en.wikibooks.org/wiki/Chess_Opening_Theory/1._Nc3
http://www.chessgames.com/perl/chessplayer?pid=102164
GOOD LUCK - you'll probably need it playing this opening, although it might work for you in blitz and OTB chess
PS: I suggest you set up a thematic tnmt with 1.Nc3 (you can make it open or limit it to players rated under 1800 or whatever your preferred ceiling is) and enter it yourself of course, that's one way to get some experience here.
Does anyone here like to open with Nc3 ?
If so, will you share why and what your strategy is when using it?