Aliens and humanity always go in so many directions; we have so many languages, so many cultures and so many people on this Earth that it's hard to truly figure out how to communicate with them.
Aliens may have different ways of interacting; hell, even different ways of communicating. I don't think that our current methods like morse code and data stream will work mainly because they're too insufficient to reach those aliens.
I do believe that the aliens will contact us instead, whether their peaceful or not will come from how we manage to present ourselves. If we present ourselves well then good things will come from it, massive advances like disease prevention and even time travel will be possible. If not then it's been nice knowing ourselves because a full out destruction will occur.
Or it may be possible that nothing will happen at all, only time will tell.