You can do a relatively basic install of OS9. If you used an external hard drive for backing up, remove it before proceeding. You are now ready to install OS X. Follow the instructions for installing OS X. Use the second partition for the installation. There are various preferences in OS X for changing the behavior and looks of the finder. You can have it open a new window or use the existing window when opening a folder or volume.
Removable media can show op on the desktop if desired.
You can select a color or picture for the background of a window. Each user can set most preferences independently of other users. I have not found a way to have it automatically change resolutions when changing users. Most other items will change. Another difference is in list views.