The theme documentation is a good start for setting up the basics. I’m not sure what you mean by the first issue with the logo.
The accordion is set up by choosing either posts from specific categories or all categories to be displayed within it. This is set in Newscast Options>Mainpage Options> Featured Slider Categories.
These are Posts that you create (not pages) and set into categories you want. For each post, you can add images using the box on the right hand side of the editor labeled “Post Thumbnail Options”. Add your image, choose the link behavior with the drop down and that is it.