Ping's website gives you a rough starting point for what you might need. But, test-hitting combinations of shafts and heads from the Ping fitting cart would be the more reliable way to go.
Do you lose anything with the "easy to hit" hynrid. - Page 2
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Can highly recommend Cleveland Hybrids. Mine are 18* and 23*. Most confident clubs in the bag. Frankly, i find it difficult to hit bad shots with these clubs. Some combination of shaft flex, shaft length, head size and weight just conspire towards nice ball flight and very acceptable distance. I no longer carry 3,4, or 5 irons.