You'll meet your guide in Pompeii. Buses and trains go from Rome to Pompeii. We met our tour guide at the coffee shop just outside the entrance to the historical site.
When you look at the tour Information it should tell you where you meet up. If not you'll get all the information on where you meet in the email after you've booked. (Walk from Pompeii train station to the historical site of Pompeii is around 10 min)
No, for this tour you have to get to Pompeii in your own. There is a train from Rome to Pompeii, but there are also other tours that pick you up in Rome and take you to Pompeii
Get an answer from Skip-the-line Small Group Guided Tour of Pompeii top Highlights with local guide staff and past guests.