1. Where do i go to edit to turn off these following features

Who's Online, Languages, Currencies, Shopping Cart Content Box, Sponsors on the left + right columns. I don't want to turn off the entire right column

Also, i would like to turn off Top Bar containing "Home, Sign In, and Search Box"

2. Is it possible to expand Categories to show all Sub-Categories on homepage only?

3. Is it possible to allow unregistered visitor to write a review that will be posted only after approved.

4. I would like to move the entire Left Column to the right side, but don't know what file to edit.

thank you.