Every situation is different and the landscaper in me wishes I could look at your yard but in most cases I recommend the no-till approach, as in layer all your amendments on top starting with newspaper/cardboard if you dont have noxious weeds. The cardboard will attract the worms and as long as food is there and it stays moist they wont leave. I did it this way and now in my third year it is black earth down to around 9 inches. I just add more leaves/manure/compost/etc once a year. Covering it with plastic will help retain water and improve tilth. Good luck!
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