the sound film is an interesting option, BUT I agree with AgX, for your first attempt on the darkroom, you might find it easier to start with a "regular" film like Ilford HP5+ or Kentmere 400. Times are published for almost ALL developers for "regualar" films. You don't have to try to avoid the extra contrast of a a special purpose Sound recording film, you will find many more posts from folks who use those stocks regularly. In the ORWO range, UN54 at ISO 100 is a "regualr" film. (but ORWO is shaking up their entire Line it seems) Besides HP5+their is FP4+ (125) in the ilford range. Kentmere also makes an 100 speed film. If you really want a slow film - Illford makes Pan-F.