Start by watching Ehrman debate Christians on YouTube, you’ll very quickly forget all about any bias you’re concerned he has in favour of Christianity.It’s something I am interested in so need to do more reading around it. I want to find more evidence than I’ve seen or heard so far, even then it may only show that the Yeshua in question did exist but the Yeshua in question isn’t the man of the gospels.
Then I would read his book on the historical Jesus. He goes a long way to attack parts of Luke and other elements of the Gospels but his evidence for the man actually existing is beyond compelling.