So I am on a MacBook Pro, using AutoCAD 2015. I am having problems setting up the dimensions and scaling. Could someone tell me the steps to do the following? Or a link to a video that shows how to do this?

1. I would like the scaling to be a 1:2 scale, or each of the smallest boxes possible to represent 6 inches by 6 inches. 

2. When I measure a line, I want it to show in feet and inches.

3. Is there a way to save these settings so it applies to every new project I make?