I second Calendly. We at Reamaze use Calendly to schedule our demos to customers, and I strongly recommend you do the same too for demos / phone calls.

All of codegeek's points make sense, especially automation, getting a good helpdesk (we can hook you up @ https://www.reamaze.com), and hustling. I wouldn't worry too much about perfecting documentation, unless it's an integral part of your project, like if you're heavy on your customers using your APIs.

Customers initially are going to be hard to come by, so every single potential lead that lands on your site and contacts you are extremely important. Always follow up on customers, as soon as possible. Keeping up a good rapport with them especially those that are using your project, would help immensely when time comes to get them to do some co-marketing with you.