To GC !
A good place to start for play might be foraging toys
. Something you can put a treat in. Like a cleaned out tictac box, breath savers puck, a straw dipped in honey (one end) then bent to form a triangle and tuck one end into the other. A toy box with little trinkets,ping-pong balls, barrel of monkeys,plastic bracelets is a great place to hide a treat too.
Straws woven in between the cage bars is another great toy. Hang a rubber something on a piece of fleece and tie to the too of the cage so it moves.
Fleece blanket about 4" square balled up and stick it between the bars. Anything that can be tugged on, pulled apart like easter eggs with a treat inside. Maybe even a favorite fruit of veggie that part of their diet
I have some bug finger puppets that I play with them and stick in the bars too. Feathers are a favor too. With a stick and string it can make a fun interactive toy between you and them.
You mentioned they came with a wheel. What kind of wheel? Where you see blue words, you can click on them and they will take you to that topic so you can read more.
Please ask if you anymore questions. Glad you're here!