changing the background color of pages and post and adding a sidbar

I have installed the studio them and have the Front page displays set to
my latest posts now when going to the index of the blog
http://advertisingrocket.com/blog/ it list the latest post and the background is a light gray I would like to be able to change the color of the background?

also I would like to have a side var display as well I have not found a way to make the side bar display.

then if I click a title of the latest post the background is white I would like to change this to a custom color as well,

I tried setting the layout colors and was only able to change the
header background color!

A little guidance would be awesome