There’s usually a few different steps in the learning process for writing shell scripts.  The first is to figure out how to just do simple things, like write hello world to the screen.  The second is to start using a series of commands.  The third seems to be using variables.  The fourth is to start using libraries to reuse your scripts.  The next is to take variables to the next level, variabalizing everything.  Where are you at with this?