There is excellent documentation on the wiki at zmanda.com. I have typically used the quick start guide http://wiki.zmanda.com/index.php/Quick_start
. Follow the links off that page for anything that you need more details on. For example, to get to the source compilation, follow the installation link in the first section and then follow those links to get the source and to get build instructions.
To configure Amanda to use ssh for transport, follow the directions here http://wiki.zmanda.com/index.php/How...ption_with_SSH
Read through the details and then go back and follow them, making any appropriate changes for your environment.