The custom list, when created via LiveTiles Build will have the following field:
Title: This allows you to put in the title of the list item. This field is a text field.
When you drag the Custom List block onto the page you will be prompted with a dialogue box with the following fields:
List Name: This field gives a name to the list. When the list has been created, this will the name that will be assigned to the list
Description: In this field, you will have the ability to put in a description of the list.