New to SLRs. Had my 50D for about 2 weeks. Kit 17-55 lens. I'm suppose to take pictures of a couple (brother & sister in their 20s) at around noon. I am ofcourse doing this for free. 1. Can I get some tips as to what camera settings to use? I am still slow at changing exposure factors on the fly. In manual, I usually just adjust shutter speed. 2. Perhaps the "auto" mode? Or auto portrait? 3. There should be tons of light, but should I use the in-camera flash when in the shade? 4. All I have is one 4GB card. What file format should I use. These may get printed to as big as an 8x10. 5. Manual or auto focus? 6. Generally accepted standard poses or where to find them? Thank you in advance.