We are 3 months old startup, have ipad and tablet apps in developement, zero experience in sales, our developers are freshers except me with 10 years exp in cod

We are 3 months old startup, have ipad and tablet apps in developement, zero experience in sales, our developers are freshers except me with 10 years exp in coding. We thought of trying to get some customers and strangers feedback about our product and their interest before launching the apps on app store. When we mail the prospect about our product, they don't even reply, it may be discarded. We then tried showing up some data about prospects in our app, attached android, ipad images, at least they could say that they are not interested at this time, or they may decide and let us know sooner. Some of them pick our call, clarify their understanding about apps. Some of them are going ahead and asked for price, how to get the apps working on their mobile device. For each prospect, our sales rep has to spend a lot of time preparing the data that is relevant to our potential prospect, to send the screen shots. This article is very good to target high potential prospect who can give us good business even if we spend a 2-3 days to prepare the data for them. Since we lack in sales, we don't know the best way to get this done. For each prospect we have to spend a lot of time, if they are not interested, we are losing our time.