Help needed : Regarding correct use of Models

Hi all ,

I am fairly new to Ruby as well as Rails . Although I have made an
application on RoR , I am still not sure if I have put the correct
code at the correct place .

- Its a web-service client side app which doesnt use any kind of db

The problem is that I have just one controller which handles all my
business logic along with the redirection between various views of the
app. I need to make this controller light somehow .

I'd like to know if I could use Models to shift some code out of it or
else could I make more controllers share the whole logic .