Here is what I do.
First, if you have a pre drawn map, you should know what the dimensions of your map is (The whole paper, ocean everything). Once you know that, start a new map using the NEW MAP wizard. Select a size as close to yours (or even a little bigger or smaller if you have a lot of ocean around the map).
Once you have the map made, create a SHEET and a LAYER for your map image. I call mine BMP as I usually insert BMP images. It doesn't matter what you call them, as long as you know what they are. Make sure the SHEET you select is as close to the top of the Sheet List as possible (This puts it on the bottom).
Ensure you have both the Layer and SHeet selected, and the select the following:
DRAW > INSERT FILE
You will get a choice to select an insertable type file into your drawing. Navigate to your image (BMP or PNG), select Open, and you will get a copy of you image to place on your map.
You will likely see a command box coming up saying the image is too larger to place in the or something to that effect, and you can select to eitherstore the image's path relative to the drawing, or USe the absolute path. This means, when you open the CC3 file, the program just needs to know where to look for the file.
Select one, and click OK
It will now ask for the 1st corner. For now, ALWAYS select 0,0 (this is 0 miles East/West and 0 miles North/South), press enter. You will now see your file there and as you move the mouse around it grows and shrinks and everything else based on the mouse's movement which will represent the second corner. Because you know the dimension of you map (remember I asked you to do that above), you can type that absolute information into the command bar (width x height).
BINGO
You have now imbedded your 'paper version likely' in to the map. You can select things coast, rivers, vegetation etc, and place them all on the CC3 file where your old map says to place them.
AND TONIGHT, I will wright this up as a nice tutorial and put it in the tutorial forum with images.