You can set up iCloud using your ex-MobileMe email address or any other Apple ID you have. Then follow the procedures outlined here to set up your devices:
http://www.apple.com/icloud/setup/
Caveats: you will need a Mac with Lioni 10.7.2 minimum or and iOS5 or 6 device. If you had a MobileMe account but did not migrate it to iCloud before 1 August it has been deleted together with the entire contents. You can reactivate the email address by setting up an iCloud account but not retrieve the previous contents. If you did migrate then setting up the account should show your emails, contacts and calendars (though not any files which were on your iDisk).