Add attribute for publish date (type :date) - sometimes users want to publish created news not today. Use this attribute instead `created_at` in your plugin.

Please add attribute `hided`. Look at `content_page` model for example. Don't forget about index.

News item - it is web-page. Any web-page must have seo params. For right now please create `description` and `keywords` fields for this task (`content_page` as example).