If you want to quickly build a mobile application and explore the capabilities of our platform, you can simply install the editor and start coding your first "mdsl" file. If you edit a sample file, such as the "kitchen sink" example, you should be on your way under an hour, including watching the tutorials.
If you prefer starting from a "mockup" point of view, you will either need Baslamiq or Interface Builder. Both tools can be used to create applications for any platform. (Yes you can use interface builder to create Android layouts with Canappi).