Network like crazy. Investors invest in people they know or who know people they know.

If you don't know any investors or people who know investors, start with your family and friends. They know you and are more willing to take a risk with you than someone who doesn't know you.

I once asked an angel investor when the ideal time was to come and ask him for money. He told me "when you don't need me". If you can do anything to get closer to generating revenue now, even on a small scale, you will be in a much better position when you go to raise money.