While anxiously awaiting my order I put what I thought I would like as some pages drawn on sticky notes and then when the book finally arrived I placed the sticky notes inside the book as a planning method.
Here is my Key/Legend. Nothing fancy at all.
My Calendar Index (Calendex). I am not entirely sure I am using this correctly, but like I said the point is to customize the entire thing to you and your own needs and preferences. So for me, instead of adding my monthly spreads to the Index, I add the page numbers of the monthly spread to the bottom of the Calendex. And in the top section of the Calendex I add what page my daily notes are on (for instance my notes for March 1 are on page12). I really don't know if this is the correct way to use this... Here is the original explanation of what the Calendex is.
My Future Planning page, which is pretty self-explanatory I think.
And this of course is my monthly spread, which I might change next month because I'm not entirely sure I like it this way. That's the beauty of the Bullet Journal.