The recommended way to create a daily agenda is by adding a Notes module to your Bulletin Board. The same could be done by adding a daily Text Module, but the page will take longer and longer to load as well as to update until it becomes unusable.
Head for the Bulletin Board section of one of your classes and click the Edit button:
Now click the white plus sign then choose to add a Notes Module:
Choose an appropriate title and set the number of notes to display. Keep in mind that a "Show All Notes" button will be available for students to read older posts.
Finally, click the Publish button:
Click the Add Note button in the Bulletin Board:
Fill out the form and click Publish. That's it!