How to Create a Google Drive without GMail
See Accounts.Google.com/SignUpWithoutGmail and ..
How to Share Files to your Google Drive
Look for an email with “Folder shared with you:” in the subject.
How to Install the Google Drive desktop/mobile Application
See https://support.google.com/drive/answer/7329379#zippy=%2Cdownload-install-google-drive-for-desktop