Hello,
I have not yet used the Array plugin built into C3 yet. I am a javascript programmer so I do most of my programming using scripts over event sheets but the concepts remain the same.
The array documentation is well written but for someone new to programming concepts in general I can see how it might be difficult pick up right away.
In that case, there is also a good example project called "Languages from JSON template" you can find on the startup screen.
The interface to them in C3 is very similar to a spreadsheet. You would define the dimensions, which is essentially a visualization of how many rows and columns you need. Each row would be a task, each column a data point representing that task. In this case it be be a column for the task description and another one presenting if the task is complete. (check the JSONLanguageData.json file in the startup example)
Now you have your data defined you need to load it into your project using the AJAX plugin also shown in the startup example and explained in the documentation.
Once the data is loaded into memory, you can now iterate over each row spawning new text which pulls the data out of the array.
I hope it helps, i'll try help you further when you encounter more specific problems.