Simple
1. Get a Text editor like Notepad++
2. Have a Browser that points to the Roku IP Address only for side loading the zipped files for testing, like
http://192.168.1.113. Use cmd like telnet 192.168.1.11 8085 or a Telnet app like SecureCRT and set address to Telnet ipaddress of Roku Port 8085 to see output debug info while sideloading and pressing the remote control keys
4. Have a program to zip files after editing the manifest and .brs files, then sideload to test.
5. Have a FTP program to place external files like images and xml and content to a website or a cloud service.
6. Enable Developer mode on the Roku to allow sideloading.
7. Unzip the SDK to a folder an read Documentation and sideload the examples in zip directory or go to examples of the source directory make edits and zip file and sideload.
8. Have fun, Read more on the forum.