The first thing you do before you write your arrangement is to make sure you have the right chord changes. All chords are interchangeable and knowing what your options are will help you in you're writing.
In this session we look at how to replace weak, none definitive chords with stronger, more definitive chords.
The Jazz and Popular music world is II - V - I. Getting grasp on this concept will help it all come together for you.
Till the next time, thanks for stopping by.