The first things I'd recommend for a DeviceNet novice are the DeviceNet media selection guide, the DeviceNet Book of Knowledge from RA, and the tutorial PowerPoint Slideshow that gets installed with RSNetworx for DeviceNet. Because you are using ControlLogix, the big DeviceNet Modules with Logix 5000 Control Systems manual will be useful too.
I've called the Media Selection Guide "the Moby Dick of technical manuals" because everybody knows it is important literature but virtually no one reads the whole thing. The Publication number is DNET-UM072.
http://literature.rockwellautomation.com/idc/groups/literature/documents/um/dnet-um072_-en-p.pdf
The DNet Modules manual is a good summary of how DeviceNet modules work with Logix 5000 control systems. It doesn't address the less-popular MicroLogix 1500, SLC-500, and PLC-5 interfaces. The Publication number is DNET-UM004.
http://literature.rockwellautomation.com/idc/groups/literature/documents/um/dnet-um004_-en-p.pdf
In the RA Knowledgebase, the big DeviceNet Book of Knowledge is a giant collection of technical notes, authored and maintained over the last 15 years by "Doctor DeviceNet", Bob Law of the RA Commercial Engineering department in Cleveland, Ohio. Bob taught me everything I know about DeviceNet.
http://rockwellautomation.custhelp.com/app/answers/detail/a_id/44883
The slideshow is quietly installed along with RSNetworx and does a good job of describing how the Scanlist Editor, the EDS-Based Parameter Editor, and the other parts of the software work together. Search the Program Files\Rockwell Software\RSNetworxii\ directory for *.PPS files. This slideshow hasn't been updated recently but it is good fundamental overview information.
Sometimes it's also helpful to get information from a non-Rockwell Automation source. The guys at Molex (formerly Woodhead Connectivity, formerly SST) have published very good vendor-independent articles on DeviceNet wiring, signalling, protocol, and troubleshooting.
And there's an industry association for DeviceNet; the ODVA. Many of the documents and summaries about DNet can be obtained directly from them.
www.odva.org.