You should start by reading the `TrillQueryWritingGuide.pdf` that explains the basic of Trill usage, what is a stream in Trill terms, and how you can create your own application that uses it. This is a *must read* in order to understand how to use Trill.
Once you are familiar with the basics, you can move to `Ingress.pdf` that explain more in detail how to get data in and out of Trill.