Clutter and mess stress me out so I try to keep things as clean as possible.
Here's what I like to do (of course YMMV).
1) school work - I have two boxes for each kid in a closet. The top one is for everything from this year. Everything goes in there (or if I can get away with it the recycling bin if I know I would never keep it). At the end of the year I go through and pick out the highlights to move into the second bin which has all of the stuff since they started school. Everything else goes in the recycling bin.
2) Art/Craft supplies - I have a 3 trofast bins with lids so they stack from Ikea and a shelf they sit on. For shelving/organizing Ikea Trofast and Kallax are my two favourites (Kallax previously known as Expedit or something like that). I have a 2x4 Kallax in our mudroom closet so everyone has a cubbie and bin which I love. I also have a couple downstairs and one in the living room for toys/games/stuff. The kids each have a Trofast in their room (my kids are 6 & 8 so they still have toys and junk). We also have younger kids over a lot so we still have a lot of the baby toys as well.
3) Laundry - we do all of our stuff together mostly because we don't own that many clothes so my kids can't wait a week to get enough stuff to make a load and run it. Everyone's clothes go into two baskets (one dark, one light) and whenever one is full it goes into the washer. The kid's main contribution is to sort, fold and put away everyone's stuff. Occasionally they put it in and run the machines as well.
4) we have a closed cabinet under the TV that all movies, games and the console go into. We also have one end table in a corner that is the charging station. All extra cables and stuff are in a basket on a shelf in the office.
For me I have to have a home for everything and it has to be easy to put it there or else it doesn't and then it contributes to the mess. It is harder with kids so when things get really hectic and devolve I'll start with a room and keep it clean so I have a place to retreat that doesn't make me crazy. I then slowly expand so I have 2 rooms, then 3, then 4.... until the house is back to bliss
I should also admit that rarely make it to all the way to the storage room.... I'm able to block that one out and it is the dumping ground to keep the rest clean.
