An incredibly useful presentation and video put together by the gang at Andreseen Horowitz, the Go-to-Market Best Practices for Startups is a must ready for early stage SaaS companies.
While some of the topics are only dealt on a high level, it nonetheless gives you a good framework to dive into and build your own tools for your company. I have not seen a better starting guide than this one. Check it out!
Startup Web Guide 