1. It depends on the drive. If you are using KDE/Gnome, you can usually right-click on your desktop, and Select Create new Floppy or Create new CD/DVD drive (I think that is what it says.) Then,you go to the properties of that icon, and select /dev/fd0 for the floppy, and /dev/cdrom for the cd drive.
Here is a more complete FAQ.:
2. Open /etc/rc.local on a text editor, and add the command there. It will be the last thing loaded at startup.
3. I think that, if you go to System Tools>More Tools (or something to that effect) There is a Desktop Switching Tool.