Trenitalia

What exactly do you need help with?
This site may be helpful to you
https://www.seat61.com/train-travel-in-italy.htm

Or download Trenitalia’s easy to use app

If you could explain what is giving you difficulties, some of the gang here can probably help you. I will very kindly suggest that when they do, that you respond. That evidently hasn't been something you've been willing to do in the past, and it's difficult to help someone via one-sided conversations! :O)
(Edited typos)

Oscar

If you could post your dates and destinations there are plenty of people here who can help you with booking your tickets

(I've removed the phone number)

Thanks, Webmaster! You ARE supposed to be having a forum-free weekend, ya know??! :O)