How to eliminate fresh mushrooms and pea rock from whole yard?

I lately purchased a property foreclosure in NW California and the garden is sand and clay-based with fresh mushrooms and pea rock all over the garden which is 1 / 4 acre. How do I take away the fresh mushrooms and pea rock without splitting my returning. I am a 52 yr old lady and don't have a lot of cash to invest. I am new to landscape designs and if remaining to my own gadgets it seems I always do factors the painfully costly way, so I need guidance. What resources can certainly make this venture easier?
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