Putting Code/Sign Up Form into Sidebar

Hello All,

My question is 2 part.

Part 1 - I want to place a sign up form from my autoresponder into my sidebar, but as there is no sidebar.php, how do I do this. I can use javascript or html.

Part 2 - I only want certain things to appear on certain pages in the sidebar. So on page 1, I want one thing to show up that I do not want to show up on the other pages' sidebars, so how do I control content on the sidebars specific to each page?

Thanks loads for the help.