This message is to everyone who has answered and offered me advice here and many more privately directly to my email address. I have replied to every one of you and want again to express my thanks. I make this message public to say that those who made recommendations, the name that came up most frequently for a book or a course was Diahan Southard, and for a talk to listen to on YouTube re DNA for Jews Gil Bardige was mentioned the most, and several people confirmed what I knew that Arthur Sissman runs amazingly helpful webinars and workshops free of charge and, at my request, very soon he will be offering Ancestry DNA for beginners. Watch this space.
Barry Clarke
a Brit living in Sarasota.