Probably to find your first user. Get feedback from them on your prototype.
Startups aren't fungible so more info on your startup would help.
Additionally there is a wealth of resources on the Internet: some of my favorites:
How to Start a Startup: startupclass.samaltman.com Watch the whole series, or you might regret it
Lean Startup:http://theleanstartup.com/ Get this book. If you're not a reader become one. Don't skim it; read it.
Who did you build it for? Who is the customer? If you don't know find a rough definition. Then you know who to sell to and that is the important step :)
The whole thing depends on what your product is, what problems are you solving and what touch points have you identified for reaching out to your target market.
the basic idea of startups is making more than enough money and you do that by seeking funding first. But once you do that you have to answer to somebody... to shareholders. Also as things can grow, you'll have to manage employees.
ask yourself if that is what you really want. YCombinator is close.
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[ 0.79 ms ] story [ 32.8 ms ] threadHow to Start a Startup: startupclass.samaltman.com Watch the whole series, or you might regret it
Lean Startup: http://theleanstartup.com/ Get this book. If you're not a reader become one. Don't skim it; read it.
Founder's Dillemma: http://www.amazon.com/Founders-Dilemmas-Anticipating-Foundat... Read the whole book before you go get married to a cofounder
ask yourself if that is what you really want. YCombinator is close.