You might try to contact Julianne Baird, who has taught many classes on Baroque embellishment. As a soprano, she should be able to make some recommendations, or even help you develop your own ornaments if you are near enough to work with her. (I believe that she lives in New Jersey. I think you'll find that she's a very nice person as well as a fine singer and Baroque specialist).
A good coach (or conductor) should also be able to give you some help. Look for someone who is knowledgeable in Baroque repertoire and performance practice.
A music library at a good university or NY's Lincoln Center library would doubtless have books on the subject. I know that there is at least one book about ornaments for Messiah arias, and I'm sure that there must be others.
Last but not least, try searching on Amazon.com and also on some of the vocal-related web sites (try searching on "opera" or "vocal repertoire" for starters, and explore the links on various sites)--it's amazing what you can find.
Good luck! Judy
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