Hello,
1) You can specify margin for your slider in Revolution Slider settings -> Position.
2) You can divide your row with Featured products onto two columns and add to the first one shortcode for featured products widget and to the second one shortcode for newsletter.
3) Please read the following section in our documentation: 8theme.com/demo/docs/legenda/#!/widgets.
4) Also about footer creation you can read in our documentation: https://www.8theme.com/demo/docs/legenda/#!/footer.
Regards,
Jack Richardson