Just as an update of the Christmas season pictures I have taken, using flash:
It worked wonderfully until I "accidentally" pushed on the Green button, a few times, while the camera was set to Av and ended up with quite a few pics taken at a very high ISO, resulting in not so flattering results: noisy!!
I am talking about HIGH ISO, such as 6400 !!
All of the pics taken properly, using flash according to the tips provided from members on this thread, were quite good, as long as I had not pushed the Green button.
All in all, I am starting to get the hang of this, just starting!
Thanks for all of the suggestions here.
JP