I am trying to do article marketing to my products. And to do that we need to have a lot of info about the product to write many articles. So you suggest a particular way or method so that I can gather enough info to review a product or write some articles regarding it. And how much time it takes to get our articles published in EA?
Yes. Nice easy one. Read and use and test the product. You're not promoting products you've never seen, are you?! (Don't answer that!). It varies quite a bit, actually. The important thing is to maintain a steady flow of articles to EZA, and then it doesn't matter. If you submit 3 EZA-compliant articles per day there, then however long they take to publish them, after the initial wait, you'll be getting 21 articles per week published there. And that will be equally true if the delay is 1 day, 5 days or 15 days. "Steady flow theory", as physicists say.
I second what alexa_s says: Have you tried the product? Because when youhave you know it's strengths and weaknesses. If it's good, you will promote it well because it works! Nothing better than that!
If I were you I'll focus submitting my article in top 10 or 20 article directory. Because submitting your article in many article directory is not worth it.
It depends on what you regard as "worth it". From the perspective of traffic and sales, many people would agree with you. But from the perspective of building backlinks and helping out your site's position in the SERP's, this is clearly untrue: every additional directory, however bad they are, is an extra backlink, isn't it?
another silly question from me n just want to make sure can we use the same article and posted it into 10-20 article directories?
Yes, you certainly can, and hundreds (if not thousands) of internet marketers do. There are some people who imagine there's something called (by them, anyway) a "duplicate content penalty" which might discourage them from doing this. Not people who have ever stopped to think about what "syndication" means, obviously; and not people who have done their own research either, and (in my experience) not people who have the first vestige of an idea what they're talking about - but there you are: without people believing stuff that isn't true, we'd all have so much less to talk about, wouldn't we?