Create SharePoint Site
Microsoft's official steps to create a site
Sign into your work or school account at https://portal.office.com
Select the SharePoint tile on the on the Office 365 home page
Select + Create site on the SharePoint start page
In the wizard:
1. Select whether you'd like to create a Team site (recommended) or a Communication site.
2. Enter the title (and a description, if you want) for the site.
3. Select whether the group will be public or private.
4. Select a default language for your site and then click Next.
In the next pane, enter the owners and members.
Select Finish.
Add additional members to your group after site is created
Open Outlook https://portal.office.comÂ
Under Groups in the left folder pane, select your group.
Click on the Members under the group name
In the popup select Members then click Add Members
In the Add Members window enter the name of user you would like to enter and click on them (you can add multiple users)