Is it possible to do? Not create a blog in a site, but converting an existing site into a blog (wordpress) Why do i want to do it? Because it´s easier to manage/update, with features like scheduled posts and everything. If you know how to do it, please point me in the right direction. Thanks.
It can be done. You have to think of it as creating a WordPress theme that is identical to your site template. Also, in WordPress, the blog doesn't have to be the homepage, so what you're talking about works well. Here's a good tutorial on how to create a custom WordPress theme (template): http://www.merchantos.com/makebeta/wordpress/wordpress-customization/