CONCRETE PATIO IN CENTRAL NJ

I'm interested in having a concrete patio poured (residential) and am seeking referrals/recommendations on how and what to do for central NJ location where the ground is sand. How thick should it be? Re-inforcement? Gravel? etc?
Any info local companies would be great.
Size would be approximately 16 x20 with a 3 ft wide walkway from the bacy yard to the front yard driveway.. Approximately 30 to 40 feet long.
Thanks in advance. Michael
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