Originally Posted by Umer

There isn't any single method.
Every good author has his/her own experience, observation and way of expressing.
For instance if I was to write a thesis statement for a paragraph, I will first think what the paragraph will be consisting of? I will take out the key ideas of the paragraph and use them in my thesis statement. A simple example due to paucity of time is as follows.

1) Thesis statement: War against Terrorism is proving to be a curse that has completely shattered Pakistan's economy and pushed the nation 50 years back.
(This sentence gives a whole idea to the reader that I'll be talking about Terrorism, it's negative impacts on Pakistan's economy and the nation as a whole)

2) The paragraph: So now my paragraph must contain the relevant material related to war against terrorism, Pakistan's role in it, how it is affecting Pakistan's economy negatively, how the nation is being pushed back and where at the moment our nation is standing?