Determining the how for what it is you're writing will help you determine how best you should tell that story. (Taken to the extreme, this is what political speechwriters use to put the spin on what it is politicians will say, based on how they want their constituents to perceive that message.)
How do you plan to get your point across?
Do you want to tell a linear story?
Do you plan to use flashbacks to establish the history of your characters?
Keep all of these questions in mind when you're plotting and coming up with the things you'd like to write. As a preliminary step, you might want to make a checklist and check off each item as you address it.