I guess you want mining with your GPU (scrypt)?

Since you have a nVidia card you should use cudaMiner instead of cgminer (it gives you a better hashrate!).

Altough your card isn't listened here, the GTX 680M and the GTX 780M got a nice hashrate for a laptop (150 kh/s).
I'm not really into nVidia cards, but you could give it a try. I suggest you to mine 'new' altcoins with a low difficulty, mining Litecoin for example wouldn't be profitable with a hashrate of 150 kh/s.

Take a look at these websites for an idea of the profitability:
http://www.coinwarz.com/cryptocurrency
http://www.coinchoose.com/

Good luck!