I want to delete content block and add custom fields for image, like on this screenshot.
I don't want to add custom content type, I just want to edit defalt post type.
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Here is a really old tutorial, linked from the Codex, that might be instructive. (Caveat: it's from 2007; some things might be out of date.)
The above hooks are for the manage posts screen. To remove/add meta boxes to the edit post screen, see
remove_meta_box(), which can be invoked inside a callback function hooked into
Here's a tutorial for customizing meta boxes on the edit-post screen.