@Sander_Gijtenbeek I would suggest going with the direct drive trainer and actual bike that Anna recommended so you get a more immersive experience.
You will also need a device to run Zwift like a PC, tablet, phone, Apple TV, etc. You might already have that, but if you are looking for something new I might suggest the Apple TV 4k for budget and ease of use reasons (you will get better graphics on a PC with a good graphics card, but will cost more than Apple TV). Assuming you have a TV available to use as well. Then you can use your smartphone to run the Zwift companion app (this is not required, but is nice to have available for certain things like messaging during your rides, joining events, creating meetups, etc.)
Other items that are not required, but you will want. A good fan that can move a lot of air, you heat up much faster indoors. A stand or something to keep towels, remotes, nutrition at arms reach. A heart rate monitor. A mat for under your bike and trainer to protect your floor from sweat. Good, strong wifi in your home or wherever you will be setting up. Clipless pedals and cycling shoes, or old school toe clips on the pedals that tighten around any athletic shoe. Cycling specific shorts or bibs with padding.