Mr Campbell said he wanted Mr Miliband to take on critics who call him a "geek" and to highlight the difference in style between him and former leader Tony Blair.
But he criticised members of Mr Miliband's shadow cabinet for not having a higher profile, claiming they needed to show more "energy and fight".
In a Total Politics interview, Mr Campbell said he was in regular contact with Mr Miliband and had discussed subjects including his conference speech - in which he announced his flagship energy bills freeze - and the Labour leader's battle with the Daily Mail's Paul Dacre.
He said: "I talk to Ed a lot. I talked to him about his speech, the Dacre thing, you know. He phones me a lot and so do some of the others." Mr Campbell said during the conference season, at both the Labour and Tory gatherings, he was told he should get involved in the 2015 campaign.
"I will get involved, but I do have quite a nice life now," he said.
In an indication of how he believed Mr Miliband should fight the campaign, Mr Campbell suggested screening videos of his critics and then responding to them, claiming it had worked well in helping the Albanian socialist party with success.