1. Install the gem
gem install decko
Watch carefully for errors!
2. Create your new decko
Here we'll create one named "mysite":decko new mysite
3. Create / seed your database
Edit the config/database.yml file as necessary for details see Database Configuration.
Then run...cd mysite
..to create and seed the database
4. Start your server
To fire up the default, built-in WEBrick server, just run:decko server
...and point your browser to http://localhost:3000 (unless otherwise configured).
WEBrick is great for a quick test run, however, for production, you will not want to use the built-in Webrick server; you'll want to use Nginx or Apache:
Wagn in production for more advanced topics.