Before any work begins, get a pencil and paper and map out where things will go. If the space is shared, clearly define whose side is whose. Decide exactly what you have room for and where each item will go.
Bi-folds are my enemies. I know they take up less space when left open, but we’ve had one too many pinched fingers and I’ve found that regular doors can actually provide useful storage themselves.
We bought inexpensive flat paneled doors to replace the bifold’s, and used a shoe organizer to house their stuffed animals. Shoe organizers can also be used for shoes, socks, accessories and other closet storage items.