Does the Advanced Newsletter extension have email templates samples and an option to design and edit basic templates?
Advanced Newsletter has a built-in templates editor that allows you to create various templates. They can be created in the Backend » Advanced Newsletter » Templates section. The extension uses Magento WYSIWYG editor, so it is clear and user-friendly.
Is it possible to send a newsletter that contains a specific group of items from the store (images, names, links, etc.)?
With the Advanced Newsletter extension you can send any HTML content within your newsletters, but there is no special option that allows putting product descriptions and images into your templates. That's why you will have to do it manually.