The Ouya ODK is available and free. You should follow the Ouya developer documents for a walk-through of setting up your Ouya development environment. It tells you where to find and configure everything.
Once you have your development environment set up, you can create a Android virtual device (AVD) that closely resembles the Ouya. This procedure is also described in the aforementioned document. (It is also trivial test your project on an actual Ouya device, if you have one handy.)