Earnie will meet the press properly on Friday with a press conference in South Wales before the squad fly out to Southern Spain on the weekend.
He spoke to BBC Radio Nottingham saying:
"The thing I said to the manager [Malky Mackay], was I want success, really," he said.
"I want to be at this club to try to try and get this club up and that's my intentions.
"I'm excited and I'm only starting to realise how much I'm thought of down there after I've signed now. It's weird
"I'm really looking forward to it because it's a place that I know and a place I've only got good memories of and good times of.
"So I'm looking to go down there... looking forward to just working down there, being at home, seeing my family and my family coming to games and stuff like that.
"It's a big factor, but I'm obviously sad to leave Nottingham Forest.
"It's a tough decision because the fans just took to me as one of their own and I'm grateful because of that and that's why it's said to leave, but I'm leaving for a good place as well."
Earnshaw left Cardiff in the August 2004 transfer window and signed for West Brom after a season and a half he moved Norwich. For both teams he scored goals. His worst season was 2007 - 2008 when he was at Derby, they were relegated from the Premier League earning just 11 points. Earnie hardly started.
For the past three years he's been at Forest and scored 42 goals in 83 starts.
He has the honour of scoring a hat trick in all four divisions of the Football League, the League Cup, FA Cup and at international level. The only player to do that.
Welcome home Earnie.