Hi Lizzie and welcome to the English Corner!

As I think you've already been told, you can check our caresheet by clicking on the following link:

Testudo Hermanni caresheet

Actually, I'm not really and expert in tortoises and my colleagues will surely help you more than I can do, but for sure, you'll be forced to prepare an indoor settlement (terrarium) for your (future) turtle, in order to grant him/her the required heat and humidity ranges.
Most probably, this terrarium would be the house of your tortoise for the bigger part of the year, according to the outside temperatures..