Lifepath

Homeworld will tell you the region of space your character comes from. Roots will tell you he environment your hero came from. Work is the job they used to do. In Upheaval you learn why their life changed. Finally, Goal is what drives them and gives you an idea of what they want to accomplish in life. Once, or if, a hero has achieved their Goal you can decide to replace it with a new Goal, or give the journey of the hero a narrative end and start a new character. Likewise, a Goal may change due to incidents in the life of the hero. Life is messy and everchanging, so take Goals as guidelines, not absolutes.
Of course, you can always choose a specific option if you have a general idea about the character already. Otherwise, roll on the applicable table and spin a story from the results.

*these rules were first published in the Savage Worlds supplement Sprawlrunners and then modified for use here.