Ok, Iam panicking now: I did not even know how to respond to your question, as to the browser version... and had to google it!
Iam apparently using google chrome 20 (if that helps).
I have no idea how to integrate a child theme, even though I looked it up - thank you for answering though sixhours and for linking all the specific terms!
I think there is a problem with lazy sunday, simple as that, because if understand right, it is fixed, so when clicking on the small thumnail http://wordpress.org/extend/themes/lazy-sunday that shows the column in the middle, in the full theme previex the little boat and the column clearly go left. In the demo you linked is a altogether different version (the third) of what I have seen so far, since the whole screen is filled with images.....
Bottom line for that seems to be, I'd better tick 'theme options' in the filter when looking for corresponding themes to make sure I can place the column in the middle.
I need a picture and text size (so column size) of about 17 x 10 cm, that adpats to mobile devices - some pictures (I choose) should fill the whole screen (maybe I can do that with plugins).
Can I control the width of the colum and pictures in every theme?
I feel quite dumb, because every one in the forum with questions seems to know what they're doing, I have had a blogspot blog at some point, and set it up by myself...I have spent my morning going through learning technical themes but with knowing exactly how I want my site to look like, I have absolutely no idea how to get there - maybe I should just keep digging and continue asking in case I don't find the answer...