I'm an armchair entrepreneur for now (just getting that out of the way), but the advice I've seen over and over again can be generalized as: "Go out and talk to peope". You'll want to avoid starting with a sales pitch. Instead, talk to them about their business (or life) and see if your product is a fit (ie: don't try to sell a social network for cats to a dog owner). If it seems like there's some product fit, ask how they are filling the need now. If appropriate, give the the elevator pitch and a 1min demo on your live product. Ideally, convert them by having them sign up for a trial right then and there on your computer, followed by walking them through the COOLEST thing they can do on your product.
Rinse, repeat.
That's my 2 cents. Also interested what others think.