Email confirmation link after register

Hi,

Where would I begin if I want to send users an Email Confirmation Link after registration?

Right now,

1. after submitting registration form, user information will be stored immediately in the ‘wp_users’ table.
2. User login credentials will be sent in their email addresses.

I really can’t determine how to delay the insert of values in wp_users then send a confirmation link , to lessen the emails that do not actually exist.

Thanks!