I agree, sounds like an M/X/V -- if so, X is for electronic flash, M for flash bulbs, and V is the self timer. If you don't have the M and V, M will usually be closest to the X, and most shutters (in my experience) won't go into V unless cocked. Probably best not to put it in V, however -- many older shutters will jam solid if put into self timer, and only a full CLA will put them right.
Photography has always fascinated me -- as a child, simply for the magic of capturing an image onto glossy paper with a little box, but as an adult because of the unique juxtaposition of science and art -- the physics of optics, the mechanics of the camera, the chemistry of film and developer, alongside the art in seeing, composing, exposing, processing and printing.
Donald is right. If the selector is on X, leave it there.
Sounds like a prontor svs shutter. If it is the same camera I have, it is a coupled rangefinder folder. The lens is not front element focusing, the whole lens moves on a helical connected to the rangefinder. It is not easy to dismantle to cla, so don't try. My camera has the Scheider Radionar 80/2.9 lens. It gives excellent results when stopped down to f11 or f16. If your camera is in good condition, it is a keeper/user.