Just starting out in Inquisitor

[Holiad]

Well, there's no particular reason why your warband has to be actively led by an inquisitor. Even among those employed or manipulated by the inquisition, authority for a particular investigation would quite often be delegated to a senior acolyte, trusted henchman, or even to whatever suitable imperial servant had the misfortune to be in the area when the inquisition needed to requisition some personnel.

[Koval]

If you're working backwards, then think about what kind of Inquisitor would maintain such a collection of henchmen and operatives, and then build around that. I sort of did that with a few of my own characters (in that I started with the operatives and matched them to Inquisitors later, though I was rather fortunate in that I already had the fluff for their handlers ready-made because of other things).

It's worth considering that if your operatives already include one or two competent leaders (the sort that might be in the position of Acolyte Prime, if not Interrogators in all but name*), then your Inquisitor might even be the kind that sits at a desk and scries the Tarot or analyses his operatives' reports rather than the kind that goes out into the field. One of my own Inquisitors, Gelert Hesh, is exactly that -- and going from the sublime to the ridiculous, despite his tendency to pore over dataslates from the safety of his office, he's 6'5" and built like a fridge

*Case in point, Alice -- my de facto Interrogator character and a former Commissar -- is basically her Inquisitor's proxy in the field. On paper, it's because Fabian is training her up to be first a real Interrogator, then eventually an Inquisitor in her own right. In reality, Fabian just doesn't like the more mundane elements of field work and prefers moving around at a higher level.

[Keravin]

I usually start with the leader (Inquisitor, Rogue Trader, Ecclesiarch representative), but in the warband I played for the first few years of the Dalthus campaign I had the Inquisitor and two sub sets that could be led by his interrogator or his network controller.   Those sub groupings are more likely to get played whilst the Inquisitor is off hiding from assassins and sending these out to do work for him.

If you have an interrogator in your warband then consider what the Inquisitor is doing in terms of training them for the rosette, if they actually think they will become an Inquisitor, and who might be connected to the interrogator and might join them if they got promoted.