The better you understand what your calling is, the more you will get out of the calling timeline. Below are several free tools coaches use to clarify calling, taken from the book, A Leader's Life Purpose Workbook.
The Workbook includes over 60 exercises for discovering your innate design and strengths, inventorying how God has prepared you through life experience, identifying your passions, finding what energizes you and much more. It also shows how to uncover the Life Messages that make up the heart of your call and use them to create a powerful calling statement.
If you want to go deeper with discovering your God-given calling, here are more great options: