1. Run ads on Facebook, Google content network (and google search if the cpc is not too high).<p>2. Sign up at forums where your target customers hang out and help people out. Have a link in your signature that points to your website.<p>Right now, you want to get targeted traffic to your website and capture their email addresses by giving something of value. [free ebook, a discount for early adopters]. Not only will this give you a list of customers for the launch, but the ad copy and the website copy will help you understand what resonates with them [based on conversions] and will prove very useful at your launch.<p>It is never too early to build an email list.