You have several problems with your configuration that you'll need to work out. It's hard to tell where to start without more information, but http://wiki.zmanda.com/index.php/Quick_start
is a good guide that you can walk through step by step and check your setup. You have at least 5 configuration errors to straighten out going off the error messages. Take them one at a time. From the quick start you can jump out to other pages in the wiki for more detail.
What version of Amanda on what OS? Did you install from a package or build from source? If you built from source, did you do the ./configure --with-auth=ssh? (the --help will tell you what that should be. I'm just going from memory.)
If you configured amanda with auth ssh (on both the server and the client), and you did an ssh from the server to the client to set known hosts, and you copied the pub key from the server to the client and put it in authorized keys, and you can ssh from server to client using that key, and you have your dump type from the disklist set up in amanda.conf with auth ssh and pointing at the key file, then that part should work. That's only one of the configuration issues though.
Another is that you labeled your tape or virtual tape with a different label than the label string in your amanda.conf. Your tape cycle needs to be greater than your runspercycle. And so on.
After you work through the quick start guid and straighten out as much as you can, let us know where you are and what the messages are at that point. If you get to a point where you have trouble figuring out what is happening, it often helps to look in /tmp/amanda for the debug logs. They give more detail on errors.