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