When do you think I should e-mail this guy?

You need to be safe. No matter what. I would definitely say let him e-mail you. You are the woman, and should never wait, or wonder if he's going to contact you first. Don't set your sights on him. After all, you've never met him before and really, the internet is an open door for complete lies, no matter how honest he might seem, it doesn't mean he is. You are 17. You will most likely meet other guys in Cali. I can promise you that. However, if you do decide to meet him, bring a friend. Or have someone you trust drop you off so they can decide that its a safe encounter.