142312 Wordpress Mods

This should be a piece of cake for Wordpress gurus. I'm using the plaintext theme. I want to be able to add a Section to the sidebar. i.e. Joe Blow's Products Product #1 Product #2 You will show me how to easily add products in the future. I also want to add a subtitle to the header. I could normally hard code this myself but this theme uses CSS, which is over my head. Thanks!