Create a page to show my custom content

I recently installed and created a new content type, called "Assignments". This content type has no title but in the page automatically generated (by ticking "Has archive") appears a generated and unnecessary title, "Automatic draft". How can I create a custom template to show the elements of this new type exclusively but without the title?

Also, is there a way to filter the elements of this custom type by the values of a custom field? The assignments are assigned by group, 1 to 6, as a custom field. Can I create a page that shows only assignments for group 1, one for group 2, etc?

Cheers.