summerg68, I would (a) ask the Webmaster to move this thread to either Transportation or Italy, or (b) just delete this thread and start a new one in one of those two categories. This topic is about Rick's TV shows, so not many people will see your question here!
But....I'll go ahead and post here, now. When exactly is this trip? The price per person should be around 8€ + 29€ = 37€ if bought in advance from Trenitalia.com . To get from FCO to Roma Tiburtina train station (8€) to make your connection for your direct train to Venezia S. Lucia (29€), see this page from Ron in Rome . See the section concerning FCO to Rome, FR1/FM1 Train. Here is the page dedicated to the FR1/FM1 train, the schedules, etc.
When using the Trenitalia site, use the Italian spelling for the city names.
Yeah, $1150 ain't right ;-) At most, that route should cost about 118€/pp.