"I've got the graphic novels but have only read Robert Kirkman's [prequel novel] Rise of The Governor, which I thought was brilliant," he told TV Guide.
"There was so much in that book that I could [use], like the desire for survival above everything else. I'm finding out what his fears, anxieties and loves are, so I can make him my own."
Morrissey described The Walking Dead as "the right show at the right time".
"My family will be joining me in Atlanta," he explained. "I've known Andrew Lincoln [who plays Rick] from around London - we have mutual friends. And I get to go to Comic-Con."
Walking Dead creator Robert Kirkman previously insisted that Morrissey is an "awesome" choice for the role of the Governor.
"More than any other actor, David Morrissey came in and wanted to embrace everything that there is to the Governor," he said. "He knew this is a complicated character, and he knew this was a character that people are going to hate to love."
The Walking Dead airs on AMC in the US and FX in the UK.