Shooting a boyfriend and girlfriend suggestions

[Subfightersandman]

My best friend asked me to take some shots of him and his girl friend. These will be most likely outside in the daylight. There will some nature type ones ( in the grass leaning on trees things like that). And some will be with buildings (greek architecture).

Here is my equipment XSI, 18-55is, tamron 75-300, vivitar 3500 zoom thyristor flash, 33" shoot through umbrella with a black cover for reflection, and a 33" silver/gold reflector with a solid white back side.

I just got the umbrella equipment so this will be my first time using it, so my main question would be when do i want use the shoot through or the black cover for reflection. I would probably only be using it for fill light or to give them some separation from the background. I also know that the shoot through allows you to bring the light much closer to the subject.

Any other tips will be appreciated

Thanks
Roshan

[Subfightersandman]

no advice on the matter

[BigAlz1]

I don't understand what your looking for? If you're shooting in the day the only thing I would even consider on a candid style shoot would be a reflector.
Also, just on personal experience, it really matter where the sun is on the sky. I got a late start last fri. when I shot a couple outside(around 6 instead of 4) and the very orange sun and the very hard long shadows that killed about every shot. Thankfully I found some decent shade.
Hope this helps.