Here's a few to get you started.
http://www.renderosity.com
http://www.3dlinks.com/tutorials_bryce.cfm
http://www.digitalblasphemy.com/tutorial/
http://www.daz3d.com/program/bryce/55tutorial.php
There should also be a "Bryce 5.5 Artist Guide" in PDF inside the "Start > All Programs > DAZ > Bryce" folder.
In this document, you will find the guide to the interface, program design, and starting at Chapter 8 - you will find a tutorial that will show you the basics for understanding how to create objects in 3D space, as well as materials, etc.
The installer should also have written the tutorial support files to your drive, so you can work along with the tutorial.
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