“Hadassah” is a very commonly used font style for many Hebrew seforim. A licenced version can be found here: https://fontef DOT com/hadassah-friedlaender. I think there is a similar free font called Guttman Hodes. Book Antiqua is a nice English font that goes well with it. As for the font sizes, I prefer 10.5pt for the English and then adjust the Hebrew to match it in height.
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