Header image height, deletion of header image, sidebar

Hello, I have a few questions. That I'm stuck with

I bought the bonus and I did not buy the thematic support. I can not use plugins too because I'm only premium not business
Here are my questions.

  1. How to change the height of the header image of (About, Establishments, Contact) without changing the height of the homepage (Home)
    or
    I hope to delete the header image (About, Institutions, Contact) to be able to add another header for the title of each page.

  2. How to put a sidebar in my page (Contact) ONLY without using a plugin.

It's very difficult not to be able to use plugins. And I hope someone can help me here. Thank you! Have a good day

This is the link to my page: http://www.mcleifz.com