hey hey lorie
stay away from getyourguide.com and viator.com for transportation from airport. they are third party resellers as Christine H
mentions.
a few other ways are:
venicelink.com
alilaguna is a slow boat to city center train station, carry you bags, hopefully not heavy, and sit with dirty salty window, many people getting on. cheapest, you need to take it all the way to "ferry stop" san zaccaria and have directions to your hotel
venice shuttle:
private water taxi that is shared for about 35E+, may have to wait at airport hall terminal for 15-45 minutes until others get on. the drivers help you put your luggage on and no need to worry after that and help you off when you arrive at stop. some of these water taxis take you as close to your place as possible.
motoscafivenezia.it
change to english, most expensive 120E for up to ten people is this fabulous fast motor boat. best way to get into venice to where you are staying. we have used this 4 times, and have just added it into our vacation budget and split it amongst friends.
there are also buses from the airport to piazzale roma, end of line. then a vaporetto or water taxi to your place. if your first time you will need a good map, walking on uneven cobblestones, steps/stairs over many bridges, getting lost within the alleyways which always happens but not to stress out the first time there. it's your decision what you want to do and what priorities means to you
europeforvisitors.com
read about venice and what to expect look for. it's a fabulous place, been 3 times and one of my favorites. any more questions just ask, people here on forum will give you good bad and ugly.
aloha