Before you get started, you will want to be aware of Denver's zoning ordinances and fees for chickens. If these don't sound too daunting, there are a few other things to consider and the Library has lots of books that can help you out. Be sure to do your homework before you buy your chickens!
Check out coop design plans if you're interested in building your own coop.
Find out what chicken breeds might be best for the space you have and your family's needs.
Visit local farmers' markets, like the Denver Urban Homesteader's Farmers' Market, to talk to people who have already been through the process.
Finally, there are many online forums perfect for learning more about raising chickens whether you're living in an urban, suburban, or rural environment.