Spray your zucchini plants once a week with a solution of 1 part milk to 9 parts water. You can use any kind of milk available. This will keep your plants from getting powdery mildew, a serious threat to zucchini plants.
This is a wonderful site to plan my garden from start to finish. You tell it where you live it tells you what to plant and when, designs your garden for you and gives you daily reminders of what to do to your garden.
Wet newspapers and put layers around the plants overlapping as you go; cover with mulch and forget about weeds. Weeds will get through some gardening plastic; they will not get through wet newspaper. Good composting!