Reduce space between posts and comments

Hello everyone!

I’m trying to reduce the space between by blog posts and the author/date/comments line that appears under every post. I feel there is just too much white space in between.

Where in the style sheet can I change it?

Also, I’d like to reduce the space between the author/comments/date line and the comments that appear under each posts.

Third, I’d like to replace the regular “<< previous” and “>> next” buttons with a graphic, where in the style sheet can I find the according code to alter this?

Thank you for your guys’ help, this forum has been very helpful so far!!