Should I create the basic shapes/ buttons/… first? And somehow connecting it to the Repeaters with code??
This is one possible solution, yes.
But this would cost you a lot of coding time.
You would have to generate a whole “Slider-Dot-System”.
A very similar function can be achieved by using a “PAGINATION-ELEMENT” + SLIDES…
Pagination - Velo API Reference - Wix.com
slides - Velo API Reference - Wix.com
This could maybe work for you.
If not → you will have to code every single function of your CUSTOM-SLIDE-SHOW → manually!