Ok, having to create a csv feels like quite a bit of overhead! I don’t have a final list of my tags, just like categories.
So it looks I need to « design » the structure of my community outside of discourse, and once I am set on my categories and tags and colours and descriptions, go and add them in, because what I see of the interface so far is not really helping me do that part of the job (the thinking, trying something, seeing what it looks like, changing it to try something else, tweaking this and tweaking that, moving things around some more, and so on…)