How do I create a blog in MODx?

I am really newb in modx.
Please someone give me full answer-how to make a blog with "post-preview" and "full posts" and to make it "commentable" for registered users????

Use the PubKit set of snippets http://www.pogwatch.com/pubkit.html

For Commenting use the Jot snippet http://wiki.modxcms.com/index.php/Jot

The Jot snippet tags would go in your blog post template.

For Revolution:
http://rtfm.modx.com/display/revolution20/Creating+a+Blog+in+MODx+Revolution

Also, if you use a more descriptive subject line - like ’How do I create a blog in MODx?’ - people will be more likely to view and respond to your post.