How to get field values from a lookup field entity

Hi All,

My javascript skills is still shaky,I want to know how to get values from a lookup field entity using javascript. After retrieving the lookup field on the form, like the below; 

var name = Xrm.Page.getAttribute('<FIELD_NAME>').getValue()[0].name;

How do i go one step deeper to retrieve values of fields from the retrieved lookup field?

Thank for the help in advance.