Although I use another template, I think I might be able to help.
To move the top header you would probably have to remove the related PHP code in the index.php file in your template folder.
To remove the menu or change the menu on the left of the page is much easier. This you controle under your Module Manager when you are in your Admin Panel. To remove a menu, simply unpublish the menu module that is marked as positon “left”.
To add a different menu (more than one is possible), add a module in your Module Manager and sellect the menu module from the standard list. In the settings you point this particular module to any menu that excists under your Menu Manager.
I hope this helps?