There are more similarities between free, consumer Gmail and G Suite than there are differences. In fact, G Suite can be viewed as a multi-user version of consumer Gmail.
When a single user platform becomes multi-user, an administrative layer is needed for tasks such as adding and deleting users, creating groups, assigning apps and managing security.
Fortunately, adding users to G Suite is a straightforward process for an admin. The creator of a G Suite account is a Super Admin by default. One or more admin roles can optionally be assigned to any user. One of the admin roles is called User Management Admin. This role allows a user to create, delete and update users — so, someone other than a Super Admin can be responsible for adding and removing users.
Here are video and text instructions.
Go to the admin console at http://admin.google.com. You can also navigate to the console from within Gmail by clicking on the gear icon and selecting Manage This Domain.
In the Admin Console, click on Users.
Click on the plus sign in the lower right. You will have the option to add multiple users (via .CSV upload) or add a single user. Click on the icon next to Add user.
In the Create new user dialog, enter the user’s first name, last name and email address prefix. A temporary password will be automatically created. A password can also be manually created.
Email the instructions to the new user, print them or verbally provide the user with the URL, username and password.
Step 6 (Optional)
Give the user access to any G Suite services aside from the basics. Add the user to any Groups they should be a part of. Add email address aliases for the user.