New Cavy owner!

Hello all! We recently became owners to two beautiful little female piggies as of three days ago!! They're currently in a store bought cage (this one: (broken link removed)) but I am in the process of purchasing a 2x4 C&C cage right this moment We aren't sure on what their ages are yet (anyone know how to determine that??) but we know that one is an Abyssinian and the other is an American. I have their cage currently turned into a trio-level with cardboard walls so they don't jump down/fall and get hurt, but only one will go up and down it.. I made them a fleece bottom with a bit of bedding in the corners and in their huts. There are two igloos in there (one store bought and one homemade cardboard box. They'd rather stay in the cardboard one hehe I've been doing tons of research over the past year to make sure we're doing everything right...well, besides buying a C&C right away, I actually just heard about them :/ ...but now that they're here, I feel like I don't know anything at all. So any advice you can throw my way would be awesome!