Hi Antonie,
I am not as experienced as everyone in here, but i can tell you what i did as a new diver (last year).
Unlike the suggestions and what most people do i got a DC before starting any of my classes. I got a Suunto Vyper Novo 2 weeks before flying to Greece for my OW and AOW.
My thought was that during the courses i will also get used to my DC and feel comfortable using it after the classes alone. Luckily my instructor had exactly the same so i didn't even read the manual (that's bad, you should read it).
No matter what you buy as your first DC (except if it is a Shearwater), at some point if you keep diving you will want to upgrade it. So just go for a fairly cheap one (remember that usually you get the quality you pay for, don't go for the cheapest IMO), get used to it, dive with it for a few years and if you like the sport then go for the best and never buy one again (unless it is broken).
I just upgraded my DC with AI, but i am really missing the bluetooth functionality. I won't go for a new one as during covid times i bought all of my equipment + a drysuit so now i will eat pasta and rice for the rest of the year
As someone told you before me, you got a lot of options but in the end it is up to you. I find it super necessary to have your own DC and be familiar with it. Also, get to dive more! I am diving 1-3 times a week here in Denmark with 15 degrees and the depth is usually 5m with no sea life almost. I am sure your place is much better, even if you don't appreciate it as you always had it. Go and dive every shore with a buddy and even if it is shallow get the chance to exercise some skills, do some weight check, dsmb or just enjoy the viz and the sea life. Note that if you manage your boyancy in this depth, when you go deeper it will feel so much easier!
Welcome to the sport and feel free next summer to join me in Volos