How do I do article marketing in the right way !?

I recommend starting off with an appreciation of the fact that article marketing has nothing intrinsically to do with SEO and keywords.

You're not ready to start article marketing while you're thinking about articles primarily in terms of keywords.

Absolutely no disrespect implied at all, but this is so fundamental and essential to grasp that trying to give a detailed answer to your question would genuinely be doing you a disservice, while pointing out that it's just a "bad question" is actually much more accurate and potentially helpful.

Here's a one-post overview of how article marketing really works.

And here's a one-post overview of how article directories really work - clearly not, in itself, the most interesting or relevant of subjects to article marketing, admittedly, but that particular post happens to contain a fairly substantial list of links to other threads which collectively provide some orientation in the basics of article marketing.

And here's one little tip which it may help you to be aware of, even before you start reading: article marketing isn't about "how many articles you have" - it's about "who reads them", i.e. where you manage to get them published in front of the already-highly-targeted traffic you want to attract to your site, to build your list.

For later reference ...

this post comments on how to write them to make that happen, and ...
this one on how to find those places where the right people are already looking, and ...
this one offers suggestions on how to ask them.