Questions on HP5+ and D76 from beginner

Couple of Questions.... 1. I shoot 400 speed film and I am wondering what the effects of slowing or quickening my shutter speed does to the film. 2. I found some D76 film developer in a cupboard opened and another in a fridge closed (all at work). I'm sure the stuff is at least 5 years old. What's the shelf life? 3. I'm starting up my own little darkroom - with my film, any suggestions as to the type of film developer, print developer, stop, fixer, etc.... THANKS!!!

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