They are wonderful creatures! I have two and they are very sweet. They're currently in the house, but will be moving into a custom-built shed shortly, at which point I might get them a couple of pals.
If you keep them inside you'll never be able to open the fridge door or rustle a plastic bag without hearing about it. Mine are convinced they are starving if they've not been fed for about 2 minutes, and like to make sure I know about it!
I use washable incontinence pads (that are made for beds) as their substrate, and when they get a bit old (ie chewed) I use wood pellets (same as cat litter, but I buy the ones sold to be burnt as they're cheaper) underneath the pads. Clean them out three times a week (poos, hay and food goes into the compost, then washed in the machine inside a horse bag).
Unlike rabbits they don't need vaccinations, and rarely go to the vet (though one went three times recently due to hay poke, and was close to losing her eye, but is fine now, albeit with limited vision).
Their main food should be hay, then a few decent-quality pellets and fresh fruit and veg daily. Like humans they can't synthesise vitamin C so need their 5 A Day (though it's more like 500 a day!). This does mean that your shopping basket will look INCREDIBLY healthy.
Enjoy them. They are darling creatures.