Setting up a quadratic equation from a worded question...

Hi, not sure whether this is Pre-uni or uni mathematics but any help would be greatly appreciated. The question states:

"The canteen in the Davis Road building occupies a total floor space of 12000m2. It is to be redeveloped into three separate areas. Area 1 will be self service. Its length will be twice its width. Area 2 will be table service. Its width will be 2m more than the width of Area 1 but its length will be half the length of Area 1. Area 3 will be academic staff only. Its width will be 1m more than the width of Area 2 and its length will be 1m more than the length of Area 1. __Set up an appropriate quadratic equation__, and use to calculate the width and length of Area 1, Area 2 and Area 3. Show all steps in your calculation clearly."

Could anyone please help me with an explanantion of how to go about completing this question? I don't even know where to start...

Thank you.