This is similar to another thread question that was asked:
http://www.japanforum.com/forum/gene...8tokyo%29.html
You need some sort of agent or agency representation to work as a magazine/commercial model in Japan.
While it may have been true in the past, foreign models are not all that uncommon in Japan and there are dozens of tall, mixed and exotic caucasian models living and working in Japan and most are fluent in Japanese or have lived there for quite a while so you have a lot of competition.
I think your Facebook friend is just flirting with you or has some type of hidden agenda.