Since there are a lot of accessories, different connections, etc., I recommend that you first do extensive research on the topic of water cooling. If you then have further questions, I recommend that you start a discussion on water cooling with the components you have already bought or which you intend to buy. Then the community can probably give you tips and suggestions for improvement more easily.
Start a discussion:
https://www.digitec.ch/de...
Water cooling components (there are more subcategories on the left and then several filters):
https://www.digitec.ch/de...
Perhaps there is already such a discussion. You will normally find further discussion contributions if you click deeper into the various subcategories. You will find the button to the discussions at the top right.