Ask HN: Whats the next step after prototype?

For years, I've been meticulously designing a web app in my head. After numerous failed attempts at finding a developer who could realize my 'vision', I took the plunge last year and began teaching myself php/web design and development.

A year later, I'm sitting on a nearly-functional prototype of a next-gen message board, utilizing all the fancy bells and whistles of web 2.0.

It still has a long way to go, but concerning demonstration purposes, it works.

As I stated, I knew nothing about programming till a year ago, and at this stage, I must admit that I know nothing about start-ups.

And that's how I found this site.

As such, I would really appreciate some answers from experienced professionals who know of the many pitfalls that surround start-ups, and who could offer some advice on things new entrepreneurs might not think about.

I've googled for various tips, and while most are good reads, they are a little too broad to really help me understand what I am up for.

Without further adieu:

1. Whats the best way to find partners, or help.

I have been developing my web app in my spare time by myself. I have some programmer friends whom I have shared the idea with, but their conviction is lacking and they can never really commit to a project, especially one that isn't their own idea.

I have read in many places that meetups are a great way to find partners. However, this brings me to a different question...

2. How should one initiate a partnership proposal?

How do you sell your idea? Are NDA's commonplace? Where can you find a good write-up for a start-up NDA? Should you incorporate? What if this person turns out to be bad news.

#2 ended up being a lot of questions, so I'll leave it at that.

All in all, the summary of this thread is essentially asking how one moves from 'prototyping' to 'perfecting' in a timely manner. Whats the best way to 'sell' your idea while taking as little risk as possible.

Thanks to all for the read.