I don't believe you have to wait 30 days, if you've activated the game (put in the code) then being on the free 30 days should be sufficient. You can view the full transfer requirements at:

http://na.finalfantasyxiv.com/lodest...nsfer_service/

But you said "the option is not available", are you looking on the MogStation? As far as I know the option is always there, it just tells you if you're not eligible when you start to use it (I haven't personally ever done a world transfer though).