The former Kiwis skipper, who is returning to rugby union after more than a decade in the NRL with the Wests Tigers, is one of three newcomers in the Auckland-based Blues' 32-man squad for 2014 announced on Wednesday.
"I'm pretty nervous to be honest," said Marshall.
"I've been in an environment for 11 years where I've sort of known what's going to happen week-in week-out, whereas now there's a lot of unknowns, and I suppose that's also the exciting part about it.
"I'm coming in as the new kid. I'm just hoping I can bring what I know from what I've learnt in rugby league, not only as a player, but as a person and a leader."
Whakatane-born Marshall's signing for the Blues has created a buzz among supporters, as was evident at the squad announcement breakfast in Auckland.
The audience sat quietly as each player made his way to the stage until it was Marshall's turn, when a spontaneous round of applause broke out.
The 28-year-old said that was representative of the welcome he had received since his shift from Sydney.
Blues coach Sir John Kirwan had a positive report on his high profile recruit's early progress.
"Everyone's really excited about his involvement," said Kirwan.
"He's already been in the organisation and everyone is impressed with his professionalism and what he's going to bring so it's going to be great to see him grow into it."
Marshall last played rugby in his teens, where he operated at halfback, five-eighth and fullback.
He said the biggest adjustment in his transition back would be getting used to the defensive line being closer.
He believed his previous experience would be a help, but also cited the example of Wallaby Israel Folau as someone who had made a successful switch from scratch.
"He had never played rugby before and he's adapted pretty well in a short of amount of time and I think I'm a pretty good learner," he said.
As for what position he would play for the Blues, Marshall said he would be happy where he was placed.
He said the plan was probably to use him initially at fullback to allow him to get a feel for the game without too much responsibility in being the organiser.
Down the track, a move to five-eighth was likely.
For now though, his focus was on putting himself in contention for selection.
"First and foremost, I have to make sure I'm in the right shape and doing the right things in training," he said.
"I back myself that I can do that, but there are some great players in both those positions in this squad and they're going to be fighting hard for those spots."
NZ SUPER RUGBY SQUADS FOR 2014:
*Blues: Backs - Charles Piutau, Benji Marshall, Frank Halai, George Moala, Lolagi Visinia, Ma'a Nonu, Pita Ahki, Francis Saili, Jackson Willison, Chris Noakes, Baden Kerr, Piri Weepu, Jamison Gibson-Park, Bryn Hall. Forwards - Peter Saili, Luke Braid, Brendon O'Connor, Jerome Kaino, Steven Luatua, Kane Barrett, Culum Retallick, Liaki Moli, Tom Donnelly, Patrick Tuipulotu, Charlie Faumuina, Angus Ta'avao, Tony Woodcock, Sam Prattley, Ofa Tu'ungafasi, Keven Mealamu, Tom McCartney, James Parsons.
*Chiefs: Backs - Mils Muliaina, Robbie Robinson, Tim Nanai-Williams, Tom Marshall, Asaeli Tikoirotuma, James Lowe, Charlie Ngatai, Robbie Fruean, Andrew Horrell, Bundee Aki, Aaron Cruden, Gareth Anscombe, Tawera Kerr-Barlow, Augustine Pulu. Forwards - Liam Squire, Kane Thompson, Sam Cane, Tanerau Latimer, Liam Messam, Nick Crosswell, Ross Filipo, Brodie Retallick, Mike Fitzgerald, Matthew Symons, Ben Afeaki, Ben Tameifuna, Pauliasi Manu, Jamie Mackintosh, Josh Hohneck, Hika Elliot, Rhys Marshall, Mahonri Schwalger.
*Hurricanes: Backs - Andre Taylor, James Marshall, Cory Jane, Matt Proctor, Julian Savea, Alapati Leiua, Conrad Smith, Tim Bateman, Cardiff Vaega, Hadleigh Parkes, Beauden Barrett, Marty Banks, TJ Perenara, Chris Smylie. Forwards - Victor Vito, Ardie Savea, Jack Lam, Brad Shields, Blade Thomson, Faifili Levave, Jeremy Thrush, James Broadhurst, Mark Reddish, Mark Abbott, Ben Franks, John Schwalger, Jeffery Toomaga-Allen, Eric Sione, Reggie Goodes, Dane Coles, Motu Matu'u, Ash Dixon
*Crusaders: Backs - Israel Dagg, Johnny McNicholl, Zac Guildford, Nemani Nadolo, Adam Whitelock, Rey Lee-Lo, Ryan Crotty, Tom Taylor, Daniel Carter, Colin Slade, Tyler Bleyendaal, Andy Ellis, Willi Heinz, Mitchell Drummond. Forwards - Kieran Read, Jordan Taufua, Richie McCaw, Matt Todd, George Whitelock, Luke Whitelock, Sam Whitelock, Luke Romano, Dominic Bird, Jimmy Tupou, Owen Franks, Nepo Laulala, Wyatt Crockett, Joe Moody, Tim Perry, Corey Flynn, Ben Funnell, Codie Taylor.
*Highlanders: Backs - Ben Smith, Buxton Popoalii, Kurt Baker, Patrick Osborne, Jason Emery, Winston Stanley, Malakai Fekitoa, Shaun Treeby, Phil Burleigh, Lima Sopoaga, Hayden Parker, Willie Ripia, Aaron Smith, Fumiaki Tanaka, Frae Wilson. Forwards - Nasi Manu, Elliot Dixon, John Hardie, Shane Christie, TJ Ioane, Gareth Evans, Joe Wheeler, Jarrad Hoeata, Brad Thorn, Josh Bekhuis, Tom Franklin, Chris King, Matias Diaz, Maafu Fia, Kane Hames, Liam Coltman, Brayden Mitchell.