The Support Forum is for assistance using the site, how to questions and technical support. I see you've posted on the Pisa destination forum and I'd suggest the same for your Florence question:
Here's the Lake Como Travel Forum:
There's also a Train Travel Forum on TA....here's the main forums list:
Most forums have some very useful information in the Top Questions section upper right.
Have a good trip!
I noticed that you inadvertently posted your question in the TripAdvisor Support Forum, so I have moved the topic on your behalf to the Florence Forums. You can also post questions in the Milan and Lake Como forums, as per the suggestions offered above by LuckyFour.
I hope you find the information you need to plan your upcoming travels.
TripAdvisor Support Team
You cannot really do this as a day trip, as trains from Florence to Como take 3 to 3.5 hours each way. See www.trenitalia.com clicking on the UK flag top change to English and looking fro trains from Firenze SM Novella to Como S Giovanni.
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