Hi. I recently became an owner of a house with a large lawn area. I have never maintained a garden before. While the lawn was full of grass when we first moved in, it is not so now. I had sprayed weed killer in one small patch of the lawn but now almost the whole lawn is full of weeds (and they over grew because I couldn't mow them in time) I have mowed down the weeds now but I need it to go back to the pretty lawn like it was. What should be my next step? Should I spray weed killer on the whole of the lawn now? Then what? Help please.????