I need your help

Hello everybody
first im so happy to find this a cool theme ” MINIMATICA ” it’s so nice
but i want to edit something in this theme

like how can i add a logo in the header?

I know i want to do this in style.css or in header.php, i know a little bit about how to editing in this files but i don’t know what’s the codes i need or how put it in the files?

Ok i need your help

1. how can i add a photo like a logo in the header?

2. how can i add a small box on left of the header? here i want to put some information about my company

3. how can i change the footer from left to right?

Thank you