I hope that I would get a helpful info regarding the Cockney accent and how can I get a good listening lessons about it.

Thank you

Cockney English is most heard in the working class areas of London, where a lot of people use it. The easiest way to pick up on it would be to go to London, honestly, or to maybe listen to people from there talk. I heard quite a bit of it on the tube when I was there haha.

One of the other ways to learn cockney is to watch a TV show called EASTENDERS, it is on the BBC channels

a quick sample
Apple and Pears = Stairs
Dog and Bone = phone
it is all about rhyming and local slang
you could also watch the movie Lock stock and 2 smoking barrels ( I think that was the name of it )

There are lots of films you could watch, like the forementioned Lock stock and another really good one is 'The Business' this one is excellent as there are lots of different people in it... basically the whole cast are cockney. There is no way of conveying an accent in written form it can only be observed by audio! So def would suggest getting the movie out.

Well, don't know about listening lessons...
But:

cockney: Information and Much More from Answers.com

That might help...