Sorry, I don't work with metric scales, so I can't really help you with that. Although it sounds like you will need to scale your drawing up to make it the correct size. Copying and Pasting to a new drawing won't help you. I believe that 1 meter = 1000mm?
To change your background color, go to the "Tools" pull down menu and select "Options". On the "Display" tab, under "Window Elements", click the "Color" button. You can change the color of just about anything from there.
To create a drawing template, just open a new blank drawing and set it up however you want it. When you are finished, save it as .dwt format. When you select the .dwt format, in the SaveAs dialog, you will automatically be directed to the correct location for saving, so just hit Save and you're done. Now when you start a drawing, just go to File > New and then select your template from the list.