Before you can write any sort of code, you'll want to have a tool that lets you edit your AddOn files. However do not get overly distracted with the tools themselves while trying to get your first AddOn created. Any text editor, like Windows Notepad can edit the files. All AddOn files are plain text files. The editors can make the coding and many repetitive tasks easier for day to day editing, but it's often very difficult to learn the tools and try to learn the AddOn at the same time.
Zygor's Leveling Guide for The Elder Scrolls Online (PC Version) is an in-game, software based, strategy guide that will show you the quickest way to level your characters from 1-50. You can view and use the guide directly inside the game without having to print out anything or view the guide in a browser. This also means that our guides are dynamic and can track your progress in realtime.