DD17 raised about 150 gerbils between the ages of 5 and 15. They were the delight of her life and she would have some now, if i would let her(she's going off to college in the fall, so no more pets!) Gerbils are communal animals, so they need to live together in groups. If they come from the same litter they will get along swimmingly. But don't try to introduce a new gerbil to their happy home--they will fight to the death and it ain't pretty.
Gerbils are desert animals, so they don't require much special food. Gerbil food will do. In fact, they can't tolerate much fresh food, like lettuce or grapes. It can give them diarrhea and they will die.But being desert animals, they also don't pee and poo much (unlike hamsters, which pee all the time!) We kept ours in a 20-gal aquarium with a wire mesh top(very important! Ours would try to jump out.) The only times we had problems with smell was when DD failed to clean the cage regularly. and by regularly I mean at least once a week. It's not an every day thing.
Be sure you can tell the gender of the two gerbils. When DD,then-5, brought home her first 3 we were told they were all girls. Well...they were ALMOST all girls. Thirty days later we found out just which ones were girls.

Gerbils mate almost immediately after giving birth, so both the girls were pregnant right away. Should this happen to you, you need to know how to deal with it. You CANNOT take the father out of the cage prior to the babies' birth. The father gerbil co-parents and without him the mother will become so stressed she will actually eat the babies.

Believe me, you don't want your child to see this. However, if there is another adult female living in the cage, a daughter or sister, you can remove the father at least 2 weeks ahead of the births and the other female will help the mother parent the babies.
Once we learned how to assess gender we made up two cages, the Boys Dorm and the Girls Dorm. Babies stay with mothers until they are 5 weeks old, at which time they can eat seeds and don't need their mothers' milk. At tthat time we separate the boys and girls. And that will stop the cycle of procreation.
I didn't find the gerbils to be difficult to care for at all. DD played with them every day. She made little clothes for them, dressed them up with her little Barbie tiaras, and road them around in her pink Barbie car.

She had a pair of overalls and often carried them around in the front pocket. The gerbils knew her and they would all stand up to greet her when she came near. DD gave each gerbil their own little pumpkin seed every day.

And they loved nothing better than a near empty toilet roll. The gerbils would sit in the corner "knitting" all day, turning the cardboard into lacy nest material.
Our gerbils didn't care for those hamster tubes. They liked their wheel and a little house to play in. Otherwise they just entertained themselves. Gerbils are not nocturnal, unlike hamsters, so they didn't keep us awake at night. For us, gerbils were a great way for DD to have pets because they weren't terribly demanding. She was very responsible about it, even at the age of 5. She never injured one and in fact, when one of them fell off the couch and broke its back, she nursed it back to health and it lived another 2 years! Most of our gerbils lived 3-4 years, We did have one Old Mother who lived to be 5.