Rats are simple to care for, I think. Make sure they have something to entertain themselves. Rats are surprisingly intelligent and can become easily stressed from boredom. Too much boredom might cause them to start attacking each other or damaging themselves. So give them a wheel or something to play with and make sure that they have things to chew on so their teeth don't grow too long and kill them. I know that last one is common sense, but you said you have never owned a furry animal before, so I thought I would mention their need to chew. Apart from that, I owned rats as pets for years and you just keep them clean, fed, watered and entertained and they're happy.