Quote from late apex:
In my view, you are starting at the wrong end, putting the cart before the horse. Don't worry about qualifying prospective investors at this stage, an NDA, etc. Do focus on qualifying yourself / your system. Ask yourself -- what would it take for a "disciplined trader" with a "decent size account" to be interested in what I have to offer? Such people tend to be both busy and selective, among other things.
Strikingly, your intro is silent on the issue of performance. Characterizing it as "amazing", without any supporting details, actually has the opposite, negative effect, credibility-wise. Two immediate suggestions:
1. Post a detailed performance report and a real-time (only) equity curve, for starters.
2. Trade your system live on Collective2 and start accumulating a public, third-party, real-time track record. Offer FREE subscriptions to your signals initially. While you're at it, study your (stiff) competition there and see if you can identify your competitive strengths and weaknesses.
There's much more to this process, but I'll let you reflect on that.