Customising template: Confit

Hi guys

I’m using the Confit theme, which looks great, but I want to make a few tweaks to it, and I simply don’t know where to… I’ve dug around EVERYWHERE. Any assistance would be much much appreciated!

The site in question is http://www.tuism.com.

Here’s what I want to do – a clear image explaining it visually is here:
https://dl.dropboxusercontent.com/u/15257303/confit_editing.jpg

1. Change the width of the content container – I’ve managed to change the wrapper max-width in style.css, but then…
2. The space between the content area and the sidebar increases – how do I reduce that space?
3. I’d like to remove this menu – It’s not part of the menus that can be made in the backend…
4. I’d like to reduce the space above the header logo image…
5. …as well as the space below the logo image.

Thanks so much for your assist!