Hi and welcome to a great and friendly forum.
My first job a few months back when I got mine was to clean thoroughly, whist it was clean, I’m a bit OCD so had to make sure it was like new. They’re 15-20 years old and most people just surface clean so a full deep clean works well. I must say that a proper shampoo of the seats/door cards/carpets lifted the interior immensely.
Thereafter I picked up the little jobs and the niggles and sorted them. I didn’t really have any mechanical things to do other than rear discs and pads. No doubt you’ll compile a list shortly, the info is then here to learn and fix accordingly.
Enjoy, they get under your skin.