As mentioned before, your goal is to focus on the early adopters. A good definition of early adopters is potential customers that have the problem you're solving, are aware of it and are actively looking to solve it.
How do you find them? I use Lean Startup/Customer Development with the startups I'm working with - (there are numerous techniques and you can be very creative with them).
To name a few:
- Meet them in trade shows
- Send them cold emails (very low response rate, but still - you just need a few)
- Targeted linkedin and facebook campaigns
When reaching out, you should experiment with your message. Don't despair once you don't get any responses. Try to figure out whether this is because your message is not compelling enough, or you're targeting the wrong group.
A/B test rigorously to find out what's the best path.
Feel free yo reach out directly if you have specific questions.