[TYPO3-mvc] Where / how to store extension related data?

[Stig Nørgaard Færch]

I'm creating my first Extbase extension. So far so good. :-)

In my BE module, I need a page where the user can edit some different 
settings and data for the extension.

First of all, the user needs to be able to edit the subject and bodytext 
of an email template.

And maybe also other data like sender email and name.

There also could be boolean checkbox data.


The good question for me is - how and where should these data be stored?


Best regards,
Stig