Your "Subpage Fullwidth" templates allows up to 8 content sections and the "Subpage Sidebar" allows up to 5 sidebar sections. Each section can contain text, images, etc.

Content > Sections

Content - This is the main content block and supports the content/styles of the page content.

Background Color - This color allows you to set the background color of the section and should be a html hex value.  A good reference is http://www.w3schools.com/tags/ref_colorpicker.asp.

Background Image - This serves as the section background image.  This image should be 1,400px in width by the desired height.  The height will depend on the amount of content in the section.  A recommended height would be between 600px and 1,200px (double for retina).

Container Full - Displays the content at full width of the users screen.

Featured Image - Adding an image to this field displays the image in the left column and the section content in the right column.  An image should always be added if you are also adding a Featured Video.  This should use the standard 1,024px wide by 576px image.

Featured Right - Switches the featured image/video to the right column.

Featured Video - Adding a video to this field displays the video in the left column.  An image should also be added to the "Featured Image" field as the preview image.

*NOTE - The only fields available for the sidebar sections are background color and background image.