HI,
I have been asked to work on recommended system.I have found out basics concepts like collaborative filtering, Content-Based Filtering, UV decomposition.

I have also found out there are tools like (In java)

1)Apache mahout
2)Lenskit
3)easyrec
4)Cofi

I now am stuck on what to do next.
I can't find a decent tutorial on how to implement any of these to make a small recommended system. Can anyone give me a push start on where to go ahead next.