Looking for a place to begin a story? A member of the online community "Young Writers Society" summed up your options perfectly.
"1) The source of the conflict (ex: if the conflict is about a war, you might want to start by going back to the moment war was declared, revealing the reasons why it's happening)
2) The day the MCs life changes. It will start off a bit slow, so you want to be careful not to bore people.
3) A point later in the plot where the MC is drawn to reflect on how they got into this situation (setting things up for you to go back to a less interesting but still relevant point earlier in the plot)
4) Character history. Pick a moment in either the protagonist's (MC) or the villains life that was significant to their development and share that. Then skip forward to the 'present' so people can see how they're changed. (Works kind of the same as a flash back). "
Yup. It's pretty awesome.