1) I house my dwarves together, but you have to be positive that they're same gender, and I would guess that a female pair is better than a male pair (less fighting, etc.)
2) They could live in a 10 gallon, but I think 360 sq. inches of floor space is the recommended minimum. Mine are in a big sterilite tub (like we use for snakes- I made a mesh top and poked some holes, and voilą!) You can look up DIY hamster bin cages. They're easy and cheap.
3) I'm not sure about food. I buy hamster specific. I do know that dwarves are prone to diabetes, so you shouldn't feed a diet that's high in sugar- don't give them very much fruit.
4) Also couldn't tell you about the aspen. I use carefresh, and haven't smelled my hamsters at all.
There are tons of hamster forums if you wanted more info
Edit- I realize this post is old, but hopefully if anyone else has questions this will help!
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