Look up 'stale seedbed' Kathy, that is similar to what you are proposing. Basically you encourage the seeds on the surface that are likely to germinate to do so, then hoe them off before sowing the plants you actually want. As Anne says however, the weeds are thought to be good for the soil - both the
roots and the top growth can add structure,
feed soil organisms, and top growth can act as a soil protector and mulch depending on the weed and the plants you want to grow.
You could try some experiments and see what works best in your soil/climate area. Everywhere is different. I find hoeing off doesn't usually work for me because in my damp climate the weeds just carry on growing on the surface! However chop and dropping when the weeds are a bit bigger can smother the roots out.