You are studying Comp Sci so it's just a matter of getting out there to build something. Yes that's probably my number one advice especially for those who can build -- just do it & iterate. Do it for the love of the product and your users :)

Seriously OzBargain wasn't started as a "startup" that you usually associated with fast growth, multiple round of fundings and then multi-million dollar exit when it's barely ramen-profitable. I love bargains and this site was started during my spare time to help other like-minded consumers, and I'm making it a full time work now as a "life style business" rather than aiming for big exit (which I believe would not benefit the users). Slow and steady is the name of the game. I was fortunately already financially secured from previous ventures so I can afford to do this the slow way. Your mileage might vary.

Good luck.