I have a Russian tortoise and they are really close to the same thing. I chop up fresh greens and butternut squash daily. I also keep some frozen in small snack bags if im in a hurry.
Give them enough food to last them 20 minutes of eating after that no more or you will be over feeding.
They are grazers. Give them lots of dandelion greens when available. I grow them in my basement. I keep mine in a 90 gallon tank up against my basement window where she gets full sunlight all day long. During the night I have a ceramic heat bulb to keep her warm. Soak them once a week in warm water for 20 min. Keep a water bowl in the tank for soaking. Provide full spectrum lighting if no real sunlight is available. When its warm build them a pen in the yard where they can party. They like to party.
And good luck. If you have any questions PM me.
Oh ya. dust food with a good calcium supplement with d3.