Starting a new project is always exciting and have the right tools is always better.
If you have to provision a lot of users on a new Smartcloud Connections environment Integrations server is this tool!
To have the integration server you need to send an email to email@example.com with Integration server enablement request - Your Customer Name" in the subject line. After few days you will be enabled to upload a CSV (or LDIFF) file inside FTP site where the Integration server will read and provision the users for you.
I think this process is explained quite well here .
For Italian admins, i've write an article with some example on the other blog.