I've seen the newspaper photogs use: In interiors: the head tilted at 90 degrees, pointing towards the ceiling and the bounce card out to redirect light unto the subject in front. In exteriors: the flash head tilted at 60 degrees, the built-in card out. Have a great time JRP (Nikonian at the north-eastern Mexican desert) My profile, My Gallery Previous photographic journey, before Nikonians: A Brief Love Story
You cannot "blindly" rely on TTL when tilting the flash head. The path of the light from the flash to the ceiling to the subject is more than double the distance from the flash straight to the subject (the distance that the flash LCD displays). Use too small an aperture, and you'd get underexposure.
Do this: - eyeball the total distance from flash to ceiling to subject. - before tilting the flash head, look at the distance scale. - use an aperture that is 1 to 2 stops within the total distance you just eyeballed. - tilt the flash head and take the picture.
If you have to work fast (weddings, party, etc.) and the above procedure bogs you down, use a fast film (at least ISO 400) and aperture-priority mode with aperture fixed on f/4. That should take care of most bounced flash exposures without worry.