Damara, as others have already mentioned, you are beautiful and no less of a woman no matter what stage of transition you are at.
I am really happy for you that you are getting the attention that you deserve, and since it is from someone on an art site and not a dating site, I feel it is likely to be less creepy (no offence meant to anyone who visits dating sites

).
Having said that, prejudice or being misunderstood by cis folks is a reality that we all have to be wary of, so it will be good to take it slow and get to know each other better. Then tell him when you think it is getting serious, preferably before he comes down to meet you or 'wastes money and resources' as you rightly said, as in that way, there is even less reason for him to feel cheated or lied to, and it will be easier to stop an online conversation than a real-life one if he can't deal with it. Until then, I would also advise keeping your personally identifiable details to yourself, just in case he turns out to be a stalker or something.
I am sorry for painting these dire scenarios, but I sincerely hope that none of these turn out to be true, and that this turns out to be the start of something really special for you. May you get all the happiness that you deserve!
Take care
Cindy