It's not quite as easy as "velocity first." However, that's pretty close. To me, it is important to encourage the intent to throw hard at an early age. I've come to believe that control isn't really a teach. You teach proper (whatever that means to you) mechanics and then work on repeating those mechanics to an extent that they are consistent. With those repeatable, consistent mechanics, control usually comes eventually - though not always. I believe, though, that if you teach that control comes from dialing down velocity and intent to throw hard, you may be dialing down something you can't get back later.