you dont fill only the to address, a from address is needed as well, the from address should be a valid email address for your domain.
to send the email to your self as well the person who filled in the form, add 2 to email addresses, for the first one, click the lightning bolt and select the the email address form element.
for the second one, enter your email address.
to redirect to the thank you page, set the Go To page option to go to the thank you page.