Hello, I would like my site title and description to go above the header image

Hello, I am trying to personalize a child theme. I would like to have the site title and description display above the header image. I think I need to add a header.php file to my child them and also add some extra css but am not sure how to go about it.

I would also like my menu to be centered on the page and not be towards the left, but have been unable to achieve either one. Thanks for the help!

Here is the link to my site:

I couldn’t get the link to show up so I put it in a code box. Sorry <a href="http://rethinkingcatholicism.com"></a>