If you want to use SAML Single Sign-On with ADFS, you most likely have one of the below environments already.
Proceed with either tutorial, depending on that.
- connect your Atlassian instance to your AD FS server, using a LDAP based user directory and enable SAML Single Sign-On
use SAML Single Sign-On with your AD FS server, using just in-time provisioning to create and update users in your Atlassian instance's existing internal user directory
please note that we are currently offering no written tutorial for migrating users via database, read here for more details