bowls might require most maintenance in the first few months after start-up. you will want to start this at home indefinitely. once it's ready and looks nice, you can move it to the classroom. but you must do it right first.
Its going to need a little work at the start before it gets its own balance and can be low maintenance. if you don;t then it will just get taken over by algae and will look horrible.
check out some bowl journals on the forum to get ideas on plants. many of us use different plants. you can choose a bigger bowl (2gals or more) and have one type of plant growing out of the bowl, and a couple of others growing under water.
having only window light support the bowl can be a challenge. usually these need their own fixtures/lamps. definitely start it out with a good lamp at home, and get the bowl full with plants before moving it.
You dont have to start out with many plants. Mine started with a single plant of most of the species i have in my bowl and grew from that.