@Mary: You can change the site title color from “Appearance => Header” and select color in Text Color and save changes.
Comic Sans MS Bold is not GPL font to be added in Theme. We are not allowed to add it. Also it is not good approach to add font for just site title. If you want site title look different, then I suggest you to use “Header Image” instead of text. For that you can go to “Appearance => Header” and upload your header image and then un-check ‘Show header text with your image’ to remove the text.
For space I don’t get it. Can you be more specific and show me in which page you have that issue.