Another vote for Stickins, for water bottles, shoes and clothes.
Get a water bottle that doesn't leak, even upside down or shaken. Otherwise their journal and books and paperwork will be ruined.
My son wasn't tired in the first term, but most are. So avoid exhausting sport or swimming lessons after school for the first term. Have a relaxed quiet half term in October. It is very busy leading up to Christmas and learning all the songs for the Christmas show.
My son couldn't do up a zip coat, so I bought a winter coat that also had press studs down the front. Practice getting dressed, undressed and turning sleeves back out. Practice eating well with cutlery.
Put a spare pair of pants in their book bag.
Don't get school coat and PE bag unless you have to, they all look the same. Put a distinctive keyring on book bag.
Get a family calendar. Mine has space to write everything I need. When an email comes called 'dates for diaries', write it all on the calendar straight away and look at it often.
If you send fruit/veg snack in, don't pick something like strawberries, they get squashy and drip in the bag. Grapes or raw carrot are ideal.
Keep your morning goodbyes quick and smiley.
Don't send anything precious in for show and tell etc, it may get lost.