Space Travel

What if humanity does develop the technology to identify and reach a planet that could sustain Earth life, but initially that technology is one way only, ie the outward bound traveller can never return?

Would we send robots? prisoners? [I ask as an Australian, living in a society partly established on convict labour] What about volunteers? Would they be scientists? anarchists? religious believers (like desert hermits)?

Who would be sent on a one way journey? and what sort of society would they establish? What would be the effect on those left on Earth?