CSS question to modify template (move navigation bar) and add Badges/ Buttons

1) How do I check if the side bar is widget ready?
What if it’s not, how to I know where in the CSS code to paste the Facebook, Twitter, Digg badges and buttons? Is there also a setting that can add the buttons to every post?

2) There is a template for the right sidebar, but not for the left one.
There are page templates with options for no comments, no date etc, but not for the main page- I have the other pages set without anything in the left side bar and I want to be able to remove the info in the left side bar from the first page and replace it with the badges. Where would I find the code?

3)I edited style.css from
#header_menu { float:right; display:inline; margin:20px 0 0 0; height:52px; background:url(img/header_menu_right.gif) no-repeat right top; }

to
#header_menu { float:right; display:inline; margin:30px 0 0 0; height:52px; background:url(img/header_menu_right.gif) no-repeat right top; }

and updated and absolutely nothing happened! What did I do wrong? Do I need to edit this in other files too?

If I slide the whole navigation bar under the name of the website, I’m hoping to fit a Links page and a Tutorials page- those should fit.