The study of Plutarch’s lives begins in year 4 (age 10). The translation by North is available for free online at Ambleside and their recommended schedule is also listed at this website:

They also have study guides available at that website which help to understand some of the context and definitions, although it does not include pronunciation which would have been rather helpful. We use youtube to learn how to pronounce the names. I do not recommend purchasing the Anna White study guide books, however. I purchased the first two and found the format difficult to read. Personally, I find Long’s translation a bit more pleasant to read and they do have a free kindle version which I find easier than going out to the website…