To protect it from dust, store it with a cap over the end. A plastic bag and rubber band should work.

You will be able to see that Saturn has rings. You should be able to see a lot of other things as well, for example, you should be able to see all or almost all of the Messier objects. If you know where to look.

As in other threads, I would recommend you get a copy of the book Turn Left at Orion to help you find objects with your scope.

On other suggestion would be to check the collimation.

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"I'm as accurate as any psychic. And I'm a cartoon!" -- Squidward

"Arrrgh, the laws of physics be a harsh mistress!" -- Bender