I would use pictures! They need to hang up their coat, so they should put their coat on the hook/hanger with their picture and name on it.
Backpacks should go in a special spot in their room. For the little ones, a picture of their backpack will show them where to put it.
Shoes go in their special bin. Each child should have their own place for things. You can use plastic bins for mittens, scarves and hats, each labeled with the child's name. Their hats, mittens and scarves go in their bin.
If you make it easy for them to figure out, they will do it on their own.
Kids do need some down time after school--after all, they've had to sit and behave all day long! I would serve a snack, and don't allow them to have snack until their belongings are put in their spot. Keep the TV off during snack.
Give them 30 minutes of free play. If you need to, set a timer. They do need to de-stress.
Then, it's organized homework time! Everyone at the kitchen table, (or wherever they do their work). Give the younger ones frequent breaks. If there isn't any homework, they can draw pictures or read books.
Then, they should be helping with dinner. Setting the table, getting things ready. They can ALL do this.
After dinner, it's tidy the room time. That way their room should still be tidy when they leave for school the next day. Part of that routine is getting out the clothes for the next day and setting up the backpacks and lunches.
I'm very organized with time :) By using pictures and writing out checklists, it helps! I don't do chore charts (too much work!) but I do have routine lists so the kids can do their own routines on their own. I put them in plastic sheets and they mark them off with a dry erase marker.
Good luck!