So, we have now the possibility to create different sections. This one is called, surprise, "Blog" and contains 3 fields. Additionally I have wrote a very small SobiPro application (it's same thing as plugin for Sobi2), to integrate Disqus into SobiPro.
I'm still not sure if Disqus is the right choice as it depend partially, I mean the counter, on the URL. So it means as soon I will implement the SEF application it will not count the comments correctly. But maybe there is a solution for it. We will see.