hi - all the startups i work with are B2B. gotta tell you that A LOT depends on type of solution you're selling, the types of companies in the industries you're targeting (are they typically early adopters, Luddites, etc.), are you going large enterprise or small businesses, how many users will have to use the solution, is security important... i could go on and on but this is core to B2B approach.
best advice i could offer in this situation from an appregatta perspective is get yourself positioned with someone that already has access to the customers you're trying to reach (a consulting firm with domain expertise, a reseller, etc.). ask them to be your product experts and hook you up with just a few prospects. there are real tricks to this to get it to work but it's doable and i see it work all the time.
another often viable option is to sell a very small piece of work as a consulting deal, and provide the prospect with real and tangible deliverables in terms of what they will get... if they get to "try out" a product also, all the better for them. but the deliverable is often an assessment and process improvement recommendations. if it's a real problem, they're likely to be willing to pay $500, $2,500, $10,000 for a consulting gig if you're team is credible and the pain is real. done right, mini consulting gigs can be easier to get meetings for and get deep into dialogue about nature of the probs at the very early stages.
so much is situational with B2B selling, it's borderline not even appropriate for me to offer much. but hopefully this gets you thinking and pushes your process forward a bit.
congrats on the biz and best of luck!