Having so much trouble working out the italian side of things 
Itinerary
Rome to Pisa 7th january early morning
same day Pisa to Florence mid afternoon
Florence to venice 8th Jan mid morning

We will be 3 pass holders and two wont be.
do te non pass holders also pay reservations or just get a ticket

trying to work out what trains run where because there are so many different types and with Eurail passes some cover and some don't. and Reservations are compulsory mainly on the ones we need as we need faster connections and on some they don't however those are slow trains

Why is there bno system considering this has been a global pass forever almost that we can enter in our train timetable between certain destinations and it tells us what trains are available on those routes and what reservations cost and are compulsory on those routes.
Surely im missing something surely there must be some kind of application you can enter in your whole train itinerary and it tells you all the possible connections and possible reservations if required.
If not its crazy, i mean we have skyscanner that can do it for flights