Not quite so posh; I was bequeathed this some years ago:-
Zeiss Ikon - "Jcarette"... maybe I ought to google it... thionking about it! Never really researched it!
F32 down to just under f6.3 'stepless'! five stops? Quite a good range for that era, I think. Only three shutter speeds though; 1/25th, 1/50th & 1/100th plus Bulb. "5cm" focal length lens!
Fine Focus by lever that moved the bellows about 1/4"
Similar situation; I had Olly OM's as main cameras at the time; no hand-held meter.
I got some Ilford 100 to try it out. Got some nice shots with it as I remember; very nice portraits as well.
Anyway; 400ASA, and F16 Sunny. Suggests A shutter speed of 1/500th @F16 as 'base' setting for out-door shots.
My camera doesn't HAVE a 1/500th shutter.... so with 400ASA film, I would have to down the shutter 250, 1stop, 125... 100's close enough TWO stops... so, up tow on the aperture, F16, F22, F32... PHEW I can 'just' stop down enough!
Check your mini aperture and max shutter speeds!
When that camera was made, 'normal' film was probably 50 or 60ASA. And 100 or 120ASA considered 'fast film'; people shot 25ASA for detail!
You may not have range of settings to stop down tight enough, even on a moderately 'bright' british summers day to avoid over-exposure.
I have an old WWI era Voiglander, as well...
I dont have that one to hand to check, but pretty sure it has only three apertures, f16, f11 & f8, and two shutters, 1/30 & 1/60!
I did run a roll through that once upon a time, but unfortunately the rollers were too far corroded and scored the film emulsion....
But; that Camera, a not so Bright Sunny day in Walsall, and 100ASA film, 1/100th @ f16 base.... nope... tightest I could go was f16 and fastest 1/60th... I had to HOPE that it was over-cast enough to avoid blowing my high-lights.
So personally, I would err on the side of caution, and towards the sort of speed film that that camera would have been designed to be loaded with; something 25-125ASA tops.
As for metering? One of the joys of antique cameras, is to do it the way they would in that cameras day. (another reason to choose slower film, as would have been available when camera was made)
It don't have a meter, because in that era, most photographers didn't USE a meter. f16 sunny or zone system guides, and off they went, metering BY EYE.
Dong get hung up trying to make it more complicated than it need be. You are stepping into the world of serendipitity.... lucky-chance!
Its chance that the camera will work at all! Chance that it wont have bludgered rollers or pressure plate that'll score the film; it'll be chance that the shutter, if it fires fires at anything NEAR the marked speed; it'll be chance that the case doesn't leak light to fog the film; it'll be chance that the focus scale is still in calibration and in your case that the range-finder mirror is still in alignment....
Chance.... upon chance... upon chance.
Go with it.... chance your EYE and go by gut. Shun the meter and 'go-with the force' young sky-walker! "In feelings you must trust, young one!" all that kind of stuff!
Old school camera; go old school with it!