I have WP-site - How I get it to Dreamweaver CC?

You must use the WP dashboard to maintain your WP site because content is stored in the MySQL database.  There are no web pages to edit in DW.

If you want to make changes to your WP Theme in DW, you will need good coding skills in PHP, JavaScript, HTML & CSS.  And more specifically, you'll need a very good understanding of  how WP Themes work.   Don't try this if you're not a good coder.

New To WordPress - Where to Start « WordPress Codex

Nancy

When you edit with Dreamweaver you will only be editing the source code of Wordpress.  You will not be editing things like your articles or blog posts or page content.  All you need to do is define your site, and download the content.  Also, if you plan on having a testing server you will need to download your database files and setup the testing database for that environment.

How to set up connection between Dreamweaver and the publishing server