I agree with what mtmaughan said.
is a good bedding. It's nice and soft and won't poke the little ratties like hay would. I've seen some people using hay as bedding for rats, but I couldn't even begin to imagine how uncomfortable that would be. It'd be like walking on dead grass, ouch!
If you're low on money a good alternative bedding would be Aspen
. It's dustier than carefresh, but it's cheaper. Never use Pine or Cedar, as these contain oils that will cause respiratory problems in most small animals.
As for food, Mazuri is a good staple diet. I, personally, like to give my rats a lab block [some good examples are; Mazuri, Harlan Teklad
, sometimes you can mix Lite Senior dog foods like Innova, Wellness, etc for variety] and a seed diet as a treat. My rats like SunSeed
... wow Petsmart.com has a limited selection. Anyways, since it's just a treat go ahead and look through hamster foods too. Find a food with lots of Safflower seeds [white seeds], fewer Sunflower seeds, less corn is better and no alfalfa. The reason I say fewer sunflower seeds is because Sunflower seeds are high in fat. Alfalfa and corn is indigestible to rats.
Oh! And a good treat once in a while is bird Millet Spray
. I know that sounds weird, but once every few months I'll throw a millet spray in my rat cages. They love to shred them apart. It's more of a toy than a treat, but sometimes they'll eat the seeds.
Feel free to ask any more questions.
Here's a couple of websites you can browse for rattie help: