Birdy, as mentioned above, you mostly just need to make sure you're on Configuration Manager version 2203 and later. To take advantage of all the UUP features, we recommend keeping superseded updates available until all the endpoint clients have been patched to a higher level. Here's how we instructed preview customers about this (we are also working on updating our product documentation with this guidance):
Ensure the last quality update installed on each PC is present in your WSUS or Configuration Manager environment, even if that quality update has been superseded. This is required for some of the benefits of UUP updates, including automatic OS healing and the ability for end users to acquire FODs or LPs. This means that you will want to make sure Quality Updates remain in your environment until most, if not all, of your PCs have installed a more recent Quality Update. This might require you to modify maintenance tasks that remove superseded updates.
For details on how to configure Supersedence Rules in Configuration Manager, see Install and configure a software update point.
For details on how to manage superseded updates in WSUS, see The Server cleanup Wizard.