Schedule a Teleconference from within Google Calendar
Step 1: Go to https://calendar.google.com/
Step 2: Create an event
Step 3: Select "Add conferencing"
Step 4: Select "Hangouts Meet"
Step 5: Change event privacy to "Private"
Step 6: Fill in additional details
Step 7: Invite guests
When it comes time to start the meeting click on the URL within the calendar invitation. Guests would perform the same actions to join the meeting.
Linked here is additional information about Google Hangouts Meet.
Image 1: Adding Conferencing
Image 2: Displaying conferencing details
Image 3: Changing event visibility to "Private"
This will prevent unexpected drop-ins from uninvited guests.