Scared, help!

I've been chatting with this guy I met online. I'm just worried about trying to go farther than friendship. It's not that I don't want a romantic relationship, but it is still a pretty big plunge to take. He does say that he's willing to accept my being atheist and a slasher. That's all I really wanted in a potential boyfriend. But there are a few obstacles along the way-I can't help but think my dad would disapprove (the guy I'm talking with is black, I'm white). I'm not entirely sure when I should voice my concerns to him. Any advice for me?