Usually in the RP its been first contact then they work out trade deals and what not. As for kicking it off it make more sense for the Kuuros to come to the Equestrians. Again while the Equestrians replaced there Battle Fleets and Planetary Defense fleets there scouts fleets were left a bit empty. Most are scouting near Equestrian borders or scouting in areas for planets to expand to where there is no confirmed signals that would indicate a advanced civilization.