It's a sweet camera. I bought a translated manual on ebay from a Russian, forget the name, because the only one online is in Russian (and Russian bablefishes badly). But it's pretty straight forward.
Put the film in, loop it through the take up spool and turn it once or twice to be sure it's taken hold. Then replace the cover and turn the knob gently until it stops. It will get a bit stiffer turning near the end as the film and backing paper comes under the sprocket on the right hand side. When it stops, the counter will be at one.
Open the front door, using you hand to keep it from slamming open. The apeture and shutter speeds are linked together as part of the EV system popular in the early '60s. Turn them together to the desired shutter speed then pull the outer ring out a bit to turn it to the desired apeture. Focus with the rear most silver knob - the RF patch is nice and bright for a folder. Then cock the shutter and use the body release to take the shot. Turn the knob until it stops and the counter shows 2. Repeat until roll done and then turn till the knob turns very freely as then the film is all on the takeup spool and you can change film. Push the focus back to infinity before closing - there is a stop that will prevent you from closing the camera if it is not.
The film mechanism and double exposure prevention mechanism require a roll of film in it to function.
It's got, to my eyes, one of the finest Tessars ever made by anyone. It does a spectacular job with film like Plus-X, Tri-X or Reala CS.
If you like yours even half as much as I like mine, you'll be quite happy with it.
William