Hello @epikayeee,
The feature to post the unique header for each page is not available in the theme. However you can disable the header image for each individual page by going to the particular page edit screen .
For this goto Admin Panel > Pages and to the page edit screen . In the bottom of the screen you can Theme setting > Header Settings . From here you can disable the header image for individual post.
Also regarding the slider section ,The theme has the option to only display in the static front page only .
But if you want such feature you can always consider hiring a professional developer .
To hire a developer please follow the link below
http://themepalace.com/hire-a-customizer/
We hope it helps,
Best Regards!