You need to contact a good engineering consultancy. Then tell him your whole problem and discuss it. The drawing you want to do should be shown to the engineer. And he will give you your exact drawing and he will take charge for it. From outside you will get many drawing images but you need to consult engineer for proper drawing. From the work of that civil engineer you can take the blue print of your house. It will also tell you if you want to modify something in the drawing.