You have to build them.
There ARE some sample dashboard and reports. We are still working out where they will be located, how they will be accessed/maintained, etc.
We are also working on creating sample sets for our other adapters/connectors as well.
My suggestion was to make them available here in the Community and also provide a way for customers to share their dashboards and documents as well. Maybe have a process where customers can upload their examples and customers can download/import individual dashboards/documents that interested them. Another possibility is to periodically combine some or all of those contributions into a single, updated sample pack.
Before I just attach a set of samples to this post, let me look into where we are with this process, since pointing you to the appropriate location may be better then putting a copy of samples in this post that could then get "old" over time, since it isn't being maintained.
Totally Agree with Gregg and it will help new Xtraction user