The logical first step in the USA is to implement a fully functioning, fully fledged Australian Rules competition that is country wide.
My understanding is that teams at the moment only compete with other teams in their similar region, and that cross country trips are rare.
There will be no AFL team in the USA in my lifetime I believe, but there is a chance to develop the game through a nationwide league in the USA, maybe as soon as over the next decade.
The only way to grow the sport in the US is through TV coverage, and this won't occur on a large scale until a nation wide league is created and supported in the USA.
Probably best to get the local newspapers to cover the sport first, and then move to regional ones, then state, etc
Building a grassroots level is what we need to do in almost every country. Yes national coverage would be great, but its the local coverage that will get people playing the sport.