How can I learn English well effectively?

I'm Aaron, a Chinese man.  I still can't speek English although even though I graduated from university four years ago.  I have almost forgotten almost all the vocabulary I studed in the school.  but Now, I have decided to go on pursue my dream that one day I can talk fluently and idiomatic [1] with a foreigner.  Recently I have started to watch the American serial "Desperate Housewives".  The story is so wonderful that I don't know why I didn't try watch it before.  I plan to learn some paid at an English training class, and after I can hope to talk with foreigner simply have a simple conversation with a foreigner. How did you learn English well and how what do you think about my idea?

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[1] 'Idiomatic' is an adjective, not an adverb.  As an example:

"I hope to have a fluent, idiomatic conversation with an English speaker."

Here, 'conversation' is the noun, and both 'fluent' and 'idiomatic' are adjectives.

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Please do not worry about the number of corrections I have made.  Half were to add correct spacing or to correct capitalization.  I recommend that you read the following article:

http://www.italki.com/article/279/five-ways-to-improve-your-english-writing

how can i learn english well

i'm Aaron,a chinese man.I still can't speek english although or even though (after writing this words you have to put Sub and Verb) I graduated from university four years.I almost forgotten all the vocabulery vocabulary i studed what I had learnt in the school.But now,i decide to go on my dream that oneday i can talk fluent speak fluently and idiomatic with foreigner .Recently, i started to watch the American serial "Desperate Housewives". That story is so wonderful that why i didn't try before.I plan to learn some paid english training class after i can talk with foreigner simply. How did you learn english well and how about my idea?