how do get from civitavecchia to marinella
By train, taking 3 to 4 hours, from Civitavecchia to Carrara. Check with the place you are staying about getting from Carrara station to Marinella: there may be a bus, but a taxi would not cost much.
You can get train times and costs from www.trenitalia.it/homepage_en.html using a travel date in the next 7 days to get costs on local trains. For some journeys, you will need to change at Pisa.