Thanks for your replies!
Maybe the best thing would be to start with the 430 Speedlight and train to use the speedlights in M mode. Then, when trained, Iwill buy some third party speedlights to use them for better lighting.
In my future plans I will buy some accessory for the speedlights (mobile softboxes) to use them outside too. We do not have an empty room in our house to use it for an studio flash system (my three children would kill me).
Another question please:
The only speedlights I used in the last years were the internal of my 7D and the Canon ring-flashlight for my 100mm Macro. I do normally available light fotography (amateur quality). So I tried to use my 550EX speedlight yesterday - after a couple of years for the first time again.
But I am not satisfied with the brightness of the shots. They are much to dark.
No changes have been made on the speedlights or Cams settings. Both (6D and 7D) have these problems.
But: If I move the switch from the "wireless" controller from off to "master", the exposure is clearly better (brighter).
And if I raise the head of the speedlight to flash indirectly, the exposure is correct.
Is this just my user ignorance, or might there be an hardware problem?
Oh, and my husband told me to study English, not to learn how to become an better photographer.... machismo
Your English is fine, I understand it well.
The Camera settings can affect flash exposure a lot. Don't use Av, for example until you understand what its doing, or you may get unexpected results.
When you set the on camera switch to Master, the camera is measuring the light and sending the proper setting to the off camera flash. (It should be set to "slave".
Its not uncommon to have to adjust flash compensation to brighten or darken exposures. It depends a lot on the lighting. Indirect off the ceiling bounce light usually looks better than direct light, and the camera often computes a different exposure for it. I see that as well.
We have some pretty good experts on flash photography here, but the website http://www.strobist.blogspot.com/ contains reliable information from a accomplished expert.
I will read in the evening.