This is my first time writing on the internet and I'm kinda mad because I erased my long response by accident. I'll try again but it won't be as long.
Art cart is the worst.
Discipline is 50% of the job. It's constant, especially on the cart when you don't have any control over the classroom set up. Here's what I did.
I rolled in and set up on visuals with magnets on the blackboard as quickly as I could. I posted a class award certificate that read:
Students ready for art_________
Ready for teacher _____________
When I checked off all areas the class keeps the award and hopefully the classroom teacher posts it. That's not all. I also gave points to the quietest tables or rows. The most points at the end of class earns stickers. Upper grades like those sports stickers... If their name is written on the board for misconduct or even a warning-no sticker. I just read a good book called The First Days Of School. by Wong? It is helpful for discipline and organization. RSVP if you want more art cart ideas.