This is what I have done so far:
--wrote a basic story premise
--created three playable characters
--created main villain
--started weapon, armor, item, and skill lists
--started gathering music
--created cold open setting (a living room, since the part the player controls is actually a TV show
--created the characters that will be watching said TV show
--wrote the script for the cold opening
--put in script that will trigger said cold opening