User Stories & User Flows
User stories are part of an agile approach that helps shift the focus from writing about requirements to talking about them. All agile user stories include a written sentence or two and, more importantly, a series of conversations about the desired functionality. I did some research & found the following template would be quite useful for writing user stories:
As a < type of user >, I want < some goal > so that < some reason >.

Here is a few examples of user stories from MY MINI BAR. As I would be able to know,
1. Who are my users?
2. What are the issues / pain points?
3. How would I solve the problems?
As it turns out, I have established a few ground rules of how to structure the app as I was proceeding to User Flows & UI Design.
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This is what it is like as I was building a wire flow upon one of the user stories with the user goal <Create New Bottle Profile>. This could be purely textual flows; however, I realized using some quick boxes & shapes and UI components may really help keeping my focus in tasks.

And for functionality-wise, it would also be nice to mention this; here's some early stage quick ideation of a very simple user registration & user onboarding flow above.