http://www.youtube.com/watch?v=Ip9IcoHLMJI
That's the boys' shed. I would definately recommend a 'base' such as a hutch, cage or dog crate, that's lined with something comfy. You can pop their food bowl here too (so long as they aren't to terratorial) although scatter feeding dry food is a great way to keep them busy.
A chair is invaluable, but make sure it's an old one that's fairly bunny-proof, or at least one you don't mind getting chewed.
A storage chest like the one in my vid is really useful for keeping woodshavings/straw/hay/food etc in, to keep the shed looking tidy and to stop the buns (and any suprise visitors!) from chewing through the bags. You can also store some of their toys in their so you can rotate them, to keep things interesting.
Do you have an electricity source you can use? A heater and a light are great in the winter.
Don't forget a bin! One big enough to last a week is best.
Um, can't think of anything else at the mo, I'll have a think for you!