I am going to start my first step. Preparing for IELTS.. From where should I start? Any book or website available for preparation?
The official IELTS website has some practice questions: ielts.org/about-the-test/sample-test-questions
As does this website: ieltsessentials.com/global/prepare/freepracticetests
These are the first 2 I found from a google search of "IELTS practice material"; I'm sure there are many more if you look.
Is one month sufficient for preparation?
I guess this depends how good your English is to begin with, and how much you practice.
Any pointers? Is there any thread for IELTS preparation? Any tips to get good scores?
I'm not sure; you could try searching the forum for "IELTS".
Also should I do the WES evaluation in parallel or can I do it after I finish my IELTS? How do people usually go about IELTS and evaluation?
You can do them at the same time, or one after the other. But doing them one after the other means that it will take longer before you can create your EE profile.
Also, if you think it might be some time before you get an ITA, keep in mind that your WES evaluation is valid for 5 years, but IELTS results are only valid for 2 years.