How Pentaho support Me?

Hi all,
I'm new to Pentaho. and I'm searching for a web based open source BI tool for a large scale project to show analytic data to multiple users (1000+ users)
by providing login Id's to individuals. So could any one tell me how Pentaho support me and please provide me if there any Licence costs. And What type types of features Pentaho have like SDK for Programmers, Interactive dashboards, report scheduling etc.

Thanks,
Ram Charan Tej Ragi