personally, I wouldn't be messing around with off-camera flash solely on film without a good flash-meter, and preferably proper studio-flash heads. Even then I found it a little hit and miss and pretty confusing. I'm just starting to get back to grips with using flash kit, and while i've taken a few frames on film, they'll be done after I've sorted things with a few dozen frames on the digital, and the settings copied over slavishly into the film camera.
As I say though, I'm still learning - and never did really get to grips with flash BITD., but I'm sure that there are some real experts that'll put you right.