I have a had a little bit of time to start on one of the maps in more detail. I'm choosing the centre southern continent. It is about 550 miles East to West and 400 miles North to South making it similar in size to France.

As you can see from the previous map the northern area is desert similar to North Africa and then down to A Scandinavian climate in the South. The range of temperatures is large because my southern area doesn't have the Gulf Stream equivalent keeping it artificially warmer. So far i have only added the drainage pattern. I have put quite a bit of thought into this:

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The higher the number of rivers is obviously related to the amount of rain in the area. The shape of the rivers is related the the hills and mountains in the area (which will be clearer when i add them!)

Next stage is to add the mountains but I'm still deciding on the style of map to try.