I have devised a system for saabstory88's method (which I support.) First, a fleet of terraforming probes are sent to the planet of choice. By the time the next wave of probes arrives, the planet will be halfway terrformed, and the second wave of probes starts building infrastructure and buildings. The last wave, a number of large ships carrying humans will arrive. A computer assigns people to homes and the people choose jobs and settle in. Construction of more colony ships and probes is started a few weeks after the humans arrive, people are loaded onto the ships and the probes are launched in waves as well as the humans and the process repeats.