I recently discovered this website (URL below) while on Pinterest. This article details a very thorough method of planning your book before you write it, ensuring that all your thoughts are complete and written out. It takes a while to complete, but your first draft will be much better. 

However, no method works for everyone, so don't use the snowflake method if it works for you! Additionally, there is no need to purchase the software if you don't want to; I made my own Wattpad book (not published) and created a new chapter for each step. That way, all of my information was organized. There's not much more I can tell you about the method, so go try it for yourself!

http://www.advancedfictionwriting.com/articles/snowflake-method/