Question about how to create newsletter templates

Hello, good friends, I have a question.

I would like to know about it in specific issues:

Builider 2.0 and Drag and drop builder online.

As or tools are used to add these features to a newsletter template?

They have a cost?

I ask these questions because I’m interested to expand my portfolio category ThemeForest, newsletter templates.

I have experience in website layout, CSS, HTML, XHTML and also new technologies, HTML5 and CSS3. Furthermore Javascript, jQuery and etc.

Moreover I have experience in PHP and MySQL. Additionally I start playing js node issues …

But really I have this doubt and I am completely new to this topic. I hope you can help me, thanks.

Nobody can’s take me a little help?

any guide??