My italy trip honeymoon

The best night train between Roma and Verona will leave you at Verona Porta Nuova station at 5.30am.
Porta Nuova is not my favorite station to hang around and I wonder what you will be doing there at dawn.

Generally, the feeling here is that night trains only make sense if the night travel time is sufficient for you to get some sleep, and there are not so many stops that they will wake you up, and the schedule does not involve changing stations in the middle of the night.
If these conditions are not met, you just arrive at the destination station early in the morning when nothing is open, when you can't check into your destination hotel, and you are exhausted and not up to doing a day of sight-seeing with no sleep, and (possibly) dragging your luggage around with you.

Do you have a guidebook to these destinations?
A standard guidebook will tell you what you want to see.
Plus please feel free to use the search box above to see the many discussion threads about these destinations.
A guidebook plus looking at the resources available on this site will tell you much more than we can here in short answers to your questions.
Sounds like you already researched Venice, you'll want to do that for your other destinations.

In my opinion, there's nothing mandatory about visiting Rome - and only 2 days each in Rome and Florence would be much too few. Since you're not enthusiastic about Rome, what about giving those days to Florence instead?

For answers to your questions about train travel times, you'll want to look at the train schedules shown on the Italian train website, which is Trenitalia.com

The biggest shopping mall in Milan is the Galleria across from the Milan Duomo.
You should probably take a look at the roof of the Duomo, across the street from the Galleria.

Thanks a lot guys for the replies. I think Rome will be omitted. The travel time is so long for very short stay.

I will do the research . Thank again

Glad to provide information you found helpful.
Happy travels,
Kent

Congratulations, and you've received good advice.

From Verona, you may want to daytrip to Padova or Ferrara. Ferrara can be a very romantic city, but I guess that's true of any place on your honeymoon!

By taking a look at the roof of the Duomo, I suggest taking the elevator (or stairs) to the roof - you can walk around easily. There is a department store, La Rinascente, across the street from the side of the Duomo (in the Galleria mentioned previously), the store has a rooftop bar and restaurant where you can order a very overpriced drink or light meal and look across at part of the Duomo (view is priceless).

Train transportation is less expensive in Italy than in other Western European countries. If you take any regionale trains, remember to validate your ticket at the machine near the tracks (sometimes at the station building wall, sometimes in the underground tunnel - sottopassaggio - leading to the tracks). On freccia or fast trains, you will have an assigned seat reservation included in the ticket, no need to validate as it is only good for that specific train.