This is how I see recipe formulation and styles. I like to imagine what I want to taste in my head first. Then I look at the simplest way to make that beer. Once I make it the first time, I can add increasing complexity of additions, because I already know where I am starting. As you get further into recipe formulation, you will know what things do naturally, but when you are starting out, I am a big fan of the simpler = better method.
For example, if I were trying to make a beer similar to yours, this is how I would approach it.
I want a beer that has the following flavors: Banana, cinnamon, vanilla, honey.
Ways I can do that: 3068 (Banana, Clove)
add honey malt
add honey (backsweeten), (only with a keg).
If I were making this, I would just use 3068 to start. When the beer is finished fermenting, I would then diagnose how it tastes, and where it differs from what I had imagined. There are some things you can do to the beer post ferment. You an add tinctures, possibly add more fermentables (bananas). Other things you have to wait until the next batch.