Hi Eswaraiah,
1. You can download the latest version of the migration tool from service market place.This will work.
2. This migration tool migrates the project files as well as configurations files, security files as well.
3. So you do not need to import any file manually.
4. I don't have any document rahter than CUG for this migration process. But you can follow the CUG for migration.
Regards,
Rohit Negi