I am an 8 time VP, WW Sales for startups and 2 time CMO. In my experience, I agree with some of the other contributors. Your Marketing approach starts with your Core Customer that I like to define simply as:
1. The person/organization that you REALLY like working with,
2. Who REALLY likes working with you and,
3. Are your most profitable.
Here is a link to my most popular blog post on the subject to help you get started.
I provide 11 ways to use this info but once you have this it, you can also find many ways to market in terms of messaging, source, etc.