Hi mum4 I've got the kindle version and have just tried to find the official order (damn it's so much easier to flick thru a book!).
Start with clothes:
Tops
Bottoms
Clothes for hanging
Socks
Underwear
Handbags
Scarves, belts etc
Swimwear type stuff
Shoes
Then books, paperwork and bills etc.
Then Komono (miscellaneous items)
CD, DVD collections
Skin care
Makeup
Accessories
Valuables (passports etc)
Electrical equipment, wires, leads, phones etc
Household equipment
Household supplies
Then you move onto sentimental stuff like photos, old keepsakes etc.
Helpful hints - sort by category not room/area, so gather all your tops together then you can easily see if you've got too many white shirts etc. any that don't bring you joy thank them and charity shop bin or whatever.
Hope that helps to get you started. 