Well I wanted to use more explicit term. Didn't want to be rude but it's "not nice" if his goal is to "to be with you" just to get a green card. I am not saying that's the case. Just "if".

If it's not the case then he is very clueless and lives in la la land. No education, no career and no experience and he will build his new life in a foreign country with a woman whom he never met. That's not adult decision on his part. No one buys one way tickets to be with someone they have never met.

Now much more reasonable would be to meet each other first without permanent move and see if you compatible. It's also important that one of you or both are independent/have your own place and means to support themselves etc otherwise it's just a fantasy.