Cloud 9 is an easy way to start developing. It's gives you everything you need without the hassle of downloading Ruby on Rails and the various tools it requires. Working in Cloud9 is just like working in a linux/unix/mac environment.The key difference is instead of using several tools (like terminal, sublime text, chrome) everything you do will be in this one tool, Cloud9.
There are multiple tiers for Cloud9, but the free one will work for class. To get started please follow the instructions below: