To figure out your Childhood(past), Present Canon*, Future of Present Canon* and Death from your past life. Using any kintype of your choice.
Present Canon refers to where your character is during the media in which they are in, or the 'present time' of the character's life. For example, Say you were reading for a character that is still alive, you would say their present canon is what happens after their show/game/source ends.
Present Canon for a character who is dead, it may be best to pinpoint a time period in your memories where you deem would be a good middleground to base your reading on. Either way, you're bound to find something out.