Bell & Howell Electric Eye camera?

I found one of these little 8mm cameras in my mom's attic and I would like to know more about it. I wound it a little and tested to see if it would roll and it did! It was a little hard to wind and and the roll sounded a little jerky, but the little film meter moved from 15 to 20 throughout my test so I think there is still film inside. I'm not filming over anything from 40 years ago am I?! I'm afraid to open the camera to get to the film because won't the light ruin it? I've never done video film before only photograph film but I would love to use this camera. I also found a Bell & Howell 8mm projector and a reel of used film that I would like to project and watch! All this stuff is very old and I'm afraid to mess it up. The camera was just sitting in a pile of fibergl insulation! I wiped the outside gently with a wet cloth and so far I haven't done anything with the projector but move around the take-up reel. What should I do before attempting to use these things and then how do I use them?