Hi Sara,
I paid around 50 euros for my Triotar-Cord (pre-war model, in excellent condition). In my opinion, it’s not worth selling your camera; you’re better off taking photos with it.
It takes 120 roll film; for instructions on how to load it and operate the camera, see the manual. You can either buy a copy from Lindemanns or search for it online and download it.
Robert doesn’t have a manual for the II online yet, but he does have one for the V with modifications for the III. With a bit of ingenuity, that should suffice for the II for now.
http://medfmt.8k.com/mf/rollei/rollei_manuals.htm
I think the Triotar is a lovely lens. At wide-open aperture, it renders a soft image (this makes for better ‘classic’ portraits than any digital method), and from around f/8 it becomes razor-sharp.
Best regards,
Franz