I think it should be "In the Kingdom of the Blind, the One-Eyed man is<remove 'the'> king.

Anyway, as others have said before this, get a fluent English speaking friend and talk to him frequently to improve your English and ask him to correct you if you speak it wrongly. If you can't, try to find some cousins or relatives that can speak it well and make it a point to speak to them as often as possible.

For getting a better vocabulary, read books and highlight the words that you dont understand.When you finish the chapter(or lets say 20-40 pages depending on the difficulty of the book) list down the words and their meanings in a book so you can refer back to them for the meaning of the words you have forgotten.

For me, I managed to find plenty of new words by reading stories written by neopets writers and other books including Lee Kuan Yew's biography my dad happened to have. *Stop laughing, I know this sounds silly*

Also, Google is your friend here. use the command,
define:(type in your word here)
or answers.com/(type in your word here) answers.com has something that can pronounce the word for you as well which is very useful.