Step to create Group / Teams Sharepoint Site
Contact the support team and raise a request for the same.
If you want to create it, kindly follow the below steps.
Go to Microsoft teams. Click Teams that is highlighted.

You will be redirected to new page with the group details, click on Join or Create Team as highlighted.

Once you click on Join or Create Team, you will get a drop down as below.

Click on Create Team.
From the template select the Professional learning Communication.

Once you click on you will get an option to Use this Template, click on it.

You may select Private or Public based on your requirement.
Give it a name and click on create.
If you want to add member or you may add later by clicking on Skip.
To open the Site in Sharepoint Follow the below steps.
Click on Files as showing in the image.

Click on 3 dots that is highlighted and then click on Open in Sharepoint

To access NoteBook / One Note Click on in the highlighted in the below image.

And make the required changes or add new files.