1) Andrà a vedere Roma?/Andrete a vedere Roma? (singular/plural)
Your attempt has been better that you thought
the translation is
2) "Spero di vedere il Foro [Romano]*, il Colosseo e San Pietro"
*or "i Fori"
3) Quali sono i prezzi?[for example if there's people of different ages, there can be discounts]
3b)Quanto costa? [like "How much is this?"]
:D If you really want to see the Colosseo have a little walk up to via Eudossiana, 'cause near the Engineering faculty [Facoltà di Ingegneria - wrote on the front] there's the "San Pietro in Vincoli" church (the one of the Moses, the statue
)...