The black board is just to block light in case you want it blocked from a certain direction... BUT if you're outside you really don't want to block any light because you NEED all the light you can get. When I take it outside, I position myself to where the sun is hitting directly on the tissue paper, but not directly on the front. The point of the tissue paper is to diffuse the light so that there are no sun streaks, if that makes sense
I have a Sony cybershot snap shot camera that takes great product pics that I used before my DSLR... IMO the secret is the lightbox. HTH!!
For the clippies, try searching the forum for Sealah tape. It's not exactly what I use, but from what I hear this stuff works amazingly