Writing is directly connected to reading,it depends how much you read and what you are reading,the spectrum of your reading will generate the rainbow of words around you,and that's how you will start playing with words.Vocabulary building is a slow n steady process,so start working on your reading habits,writing will automatically improved.

First read the books of popular authors,mark the technics with which they start , how they twist the climax , which vocabulary they use , all these things will make you ponder in your mind,and write some thing, read aloud what ever you have written , feel it as a third party , change where ever you feel and then you will have the knack of writer

One simple thing is if you control the speed ,you can write well, my experience shows that there are generally typing mistakes if you type in a hurry.

First of all read Word Power Made Easy. Norman Lewis. Go through one or two books authored by him. and get started.

Clarity in thinking gives clarity to expression. we have to write for people who race with the time, as time is precious.Again language is fluid.Prefer popular English peridicals published from the West they are more professional You can get. from the net also.

By using proper and appropriate words in crisp and focused.