I had no idea CBD seeds were legal, but it makes sense.
Although you may want to be careful with that "worldwide shipping" thing. I don't think these are actually legal to ship worldwide.
Not sure where you're shipping from, but mocacinno is right, you should at least get some TOS / FAQ stuff going on, as we don't even know where this ships from.
Plus 30 seeds for 10-20$ sounds VERY cheap.
I never had drugs in my life, but still, it sounds very cheap to me.
Hi, CBD aka Hemp is legal in almost all parts of the world now, Europe, the States, Canada, Mexico, Russia, China, Australia.
Of course if it is not legal in the place you are right now, responsibility falls to only you.