On the Trentalia website I could only find a train at night that arrived in Venice after midnight. How do I find morning trains?

Thanks

In your inquiry, you put in the time of day you want to depart. If you put nothing, the default would be the current time.

The German rail site, which covers all of Europe, is easier to navigate. Here is the English version:

http://reiseauskunft.bahn.de/bin/query.exe/en

There are trains about every hour out of Florence with a train change in Bologna. Yes, the German rail site Musicteacher provided is a great resource. If your trip is far off, you can play with the site to see what's available by just putting in a date a few weeks away from now and see what you come up with. Keep in mind you generally have to use the Italian spelling, like Firenze as the depart station (vs. Florence) and Venezia as opposed to Venice.

New timetables will go into effect throughoout Europe around 9 December. Trenitalia hasn't loaded all of them on its site yet. If you entered a date too far in the future, that is why you didn't see all scheduled trains. Enter a date near the end of November and you'll get a complete list.

Yes, but most do not stop in Bologna.

All trains from Firenze to Venezia stop in Bologna. There are several through trains a day, and others where you need to change trains in Bologna.