Re: leveling the ground, need help!
I agree with everyone else on removing more material and replacing it with a better base then compacting, but would suggest renting a wacker vibrating compactor from the local rental. They work great and are easy to use. I used these for creating the beds for cement driveways, blacktop driveways, and pool bed prep. I know the digging can be a chore if you have to do it by hand, but I suggest getting a few friends and a couple cases of beer and brats and make a party out of it. It will be short work and everyone will have a great time when it's done.