I have both piggies and rabbits. To learn more on the basics go to
House Rabbit Societyand also
Morfz
Rabbits can have C & C cages also just remember to build them higher so that the rabbit can stand and stretch fully extended and so that they cannot jump out. Most people do not use litter in the same way as you would with piggies as rabbitsa can be litter trained. My rabbits
house has cotton rugs and straw type
mats.
Generally all rabbits are spayed/neutered
http://www.rabbit.org/faq/sections/spay-neuter.html
Rabbits like to live with other rabbits
http://rabbit.org/faq/sections/multiple.html
Diet basics
http://www.rabbit.org/faq/sections/diet.html#basics
Housing basics
http://www.rabbit.org/faq/sections/housing.html
You most likely know this but guinea pigs and rabbits should not mix
http://cavycages.com/rabbits.htm
Congratulations on your new addition, I hope that this helps.