If you want current info on logistics or have specific questions after consuming all the good advice above, start following the Tripadvisor forum for Florence and Rome. As I recall from my last trip, some of the regular posters on the Rome board are a bit snarky (true of many TA forums). But I get it, these people often spend a lot of time writing up detailed answers to various questions and they don’t like it when a “newbie” comes in with a different perspective.
I personally discount much of what Rick You-know-Who says. I find he leaves out some of the most interesting places in Europe, his info is frequently out-of-date and his preferences are often superficial. Rant over. If this is your first trip to the locations, his books can generally be found in the local library and do provide a quick starting point identifying possibilities and timeframes. I prefer Tripadvisor reviews of attractions that I think I might be interested in. Very up-to-date. You might have to read between the lines on individual reviews, but there isn’t the generalized re-hashed commentary I find in RS’s materials.