I'm so excited for you! Rats are my favorite, by far! I have 17 right now, they're wonderful! You must be so happy!
Anyways, that cage is FANTASTIC! I have it for some of my little girls, and they love it. It's really easy to put together, and very safe. My only suggestion is to remove the wheel. The one that comes with the cage is not solid, so there is a chance that your rats may hurt their little feet. Look for one like this instead:
http://www.petsmart.com/product/index.jsp?productId=2753360
Next, you need a very safe bedding. I personally use Yesterday's News. It is what most vets recommend because it is dust and allergen free. It's also one of the cheaper beddings that is still safe. You can get a 30lb bag for $14, which will last you a long time with only two rats. Other beddings that are safe are Carefresh, Total Comfort, Kay Kob, or even cloth. There are benefits and drawbacks to each, but again, they are all safe for rats. Stay away from any wood shavings. Cedar and Pine are well known for causing healthy problems in rats. Many people also suggest aspen shavings, which I agree are somewhat safer for your rat, but I've read in the past that some studies suggest that they can cause some problems in small animals: http://www.geocities.com/calhamassoc/Aspen.html
Diet is a very important part of your rat's health. Packaged mixed grain diets that can be purchased at your local pet store are generally not recommended since they often contain too high a corn or seed content, and can be nutritionally incomplete. These types of diets all too often have the rat picking out only the pieces that they prefer to eat, leaving food not eaten as well as an under nourished rat. I personally rely on a homemade diet, based on grains, fruits and vegetables, but if you want the best foods, I would try Oxbow. It is a little low in protein for a younger rat, and you can supplement with higher protein foods, but after about 8 months, the food is perfect for them. You can look on this website to either order it, or find a store that carries it:
http://www.oxbowhay.com/index.sp?page=index
If you want to look into a homemade diet, try these websites:
http://www.ratfanclub.org/diet.html
http://www.ratsrule.com/diet.html
http://www.dapper.com.au/articles.htm#diet
Stay away from any food by Nutriphase or Kaytee. Both of them are known to have cancer causing chemicals. This article discusses it, and refers to mice, but the same chemicals affect rat and hamster food:
http://www.smallangelsrescue.org/doc/small_angels_rescue_mouse_mini_care_packet.pdf
Absolutely make sure that you do not feed foods that are high in fats and proteins. Your rats are very prone to getting tumors, and diet is one of the biggest contributors.
They also love to play! You can do so many things to entertain them. Bird toys are my personal favorite. You can get the ones that hang in the cage and your rats will chew them up. You can also give them cardboard, rawhide, tissue, etc. This website has a great list of homemade toys that you can give your rats:
http://www.dapper.com.au/toys.htm
Here are a bunch of other websites that can help you take the best care of your rats:
http://www.ratfanclub.org/firstaid.html
http://ratguide.com/
http://www.ratbehavior.org/Glossary.htm
Good luck, and congrats on getting your rats! Let me know if you need anymore information!