Wedding Programs Note From Couple Wedding Stationary...what's The Order? Did I Forget Something?

Wedding stationary...what's the order? did i forget something? - wedding programs note from couple

I'm getting married in October. I do not know about the marriage is everything ... let me know if I missed something ...

1. Save the date or engagement announcement, it's the same?
2. Wedding Invitations
3. Wedding Program
4. Letter of thanks