Header color, content width, content font, search box

Hi again, I'm wondering if you can help me with the following. 1) I'd like to change the color of my site title header. How do I do that? 2) Also, the width of the content is very narrow. I'd like it to match the size of the header content above. 3) How do I change the font color and size for my content? 4) I would like to add a line around my search box so that is visible. I apologize for all of the questions and really appreciate your help. I have reviewed the support forum and css tutorials and can't seem to locate this information.