So let me think

Cage: 20 gallon or bigger
Shavings: Asoen or Carefresh
Bedding: Toilet paper or carefresh
Water: Water bottle with metal guard.
Food dish: Ceramic food dish
Toys: Wheel, toilet paper rolls, lots of card board, thick amount of shavings to dig.
Bed: Just lots of shavings and they will make their own bed.
Other toys: Run-about-balls.
Food: gerbil diet

Am I missing anything?

Two more questions:

Can I have my gerbils and my hamsters in their run-about-balls together?

And What food is a good choice. (I am willing to pick out sunflower seeds)