>>I just wanted to ask, if it’s possible to not just turn around the view, but also open a link for example, by clicking the image.
no. As you need to click mouse to drag image back and forth in 360. and each time you click you will be open a link.
>>Another question would be, if it is possible to turn multiple pictures to one big panorama VR-view, or if it has to be just one image.
It need to be one big image for 360 panorama. You can make it in using photoshop or another editors then use plugin.
Best regards
Alex