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Most likely first contact scenarios:
A. They're good and tech-superior; thus, we have much to gain from them
B. They're bad yet tech-inferior; thus, we have nothing to fear
C. They're bad and tech-superior; and thus, we are doomed
D. They're good but tech-inferior; ergo, they have much to fear.
First, we will ascertain their intent and capabilities before risking exposure. Assumptions are inappropriate in uncharted scenarios like this. Caution and preparation come first, followed by a warm welcome if they turn out to be friendly. We can learn a lot from each other if given a chance.
We have no knowledge of their intent and disposition for conquest and harm.
They might have the solution to many great scientific questions that can help us as a species and boost us into a new technological age.
In space, no one can hear you scream... Seriously though, the genie is already out of the bottle. We have radio and television transmissions already that will reach "them" before long. Any new ones would not get to them any faster.
According to the Fermi Paradox, they probably have more advanced tech. than us so if we found them, they probably found us before