Hey, Welcome to Matrix Online firstly!
Also this isnt really the place to ask the question, youll find more info in your servers genreal board or here.
As a unwritten rule, Mara Central is the place you will find most operatives. But also expect to get lots of PvP there too.
What I suggest is look around for factions and speak to people and they can help guide you more, since youll find people will spread out at different locations too.