What do you think they will be like?
Not little green men. Weird things that we have never seen before, that depend on materials we don't know of, and they have six eyes and tentacles or something.
What technological level are they in/Or not.
About the level of most of our common animals, or maybe up to primates.
Are they friendly?
If simple animal instincts and/or implanting an embryo in your throat is considered friendly.
How will they respond to us?
With fear, at first. Then they may grow more and more used to us. They may even become aggressive.
How will we respond to them?
Probably try to study them, then get tired of trying to be peaceful and blow the living stuff out of their planet. Or maybe not.
What is your understanding of life?
Does not compute.
What if they are more intelligent then us, can can they do that we cannot?
We could probably negotiate with them, and form an alliance, or screw something up and they'll exterminate our whole race.