You have requested a series of modules covering the English articles system. I would love to teach you this. It is a very deep and complex subject and will take a few weeks to explore. Even then, we won't have mastered every aspect of this topic. That's okay. We will have some very helpful rules of thumb that will help us out 90% of the time to determine which article to use. Another 5% will come from memorization of exceptions or specialized rules (a cold, the flu, geographic locations). The last 5% even native speakers do not always agree on. I hope you can be happy with less than 100% perfection since familiarization with article use is a lifelong journey.
We will start with the very basics: count nouns, non-count nouns, and nouns that can be both count and non-count, depending upon the intended meaning. Jennifer (English with Jennifer, JenniferESL on YouTube) has some wonderful videos on this topic to which I would like to direct your attention.
7 Things You Should Know about Uncountable Nouns
More Practice with Uncountable Nouns
The worksheets we'll be using during our first week or two can be downloaded from my website, www.kellymorrissey.com, under FREE - GRAMMAR.