15 minutes of weeding your veg garden and general tidying up every day, will pay dividends in the long run. Weeds will not get a chance to become deep rooted, clear stones which may appear on the surface. Put weeds in the brown bin not the compost heap.
Water seeds with a very fine nozzle, keep damp not sopping wet.
Clear twigs and leaves off growing area.
Rake soil into a fine a tilth as possible for planting seeds.