DIY Paver Patio for Pool and Fire Pit in Georgia Clay

For an 18x18 ft patio on Georgia clay, minimum base: 2-3 inches compacted crusher run (granite dust). Pavers 2 inches thick can sit directly on clay but will be hard to level and may settle. Slope 1/8 to 1/4 inch per foot for drainage. Your proposed slope (1" per 3 ft, then 1" per 7 ft, then level) is adequate. Compact subgrade, add base, compact, screed sand, lay pavers. A plate compactor rental is worth it.