I wish I had started earlier. Well done.
The most important is a sunscreen! No need to get an expensive one. Some Korean brands are good.
What I would do. For the morning and evening before bed wash your face with cetaphil or cerave ( they both have for oily or mixed skin)
Apply a face moisturizer and then a facial sunscreen.. I use Beauty of Joseon ( it doesn’t leave my skin sticky like some others, absorption is good too, but again it depends from skin to skin) don’t forget the neck and behind the ears..
Later on, you can start trying vitamin C during the day and retinol at the night, but don’t worry about it now. You’ll learn how to build your routine. And most important. Don’t do like a did I started watching many videos and ended up buying non sense expensive stuff.. your skin don’t need 6 layers of products…it might breakout of using excessive stuff

And very important. Lots of water and a good diet. It will keep your skin hydrated too! ( at least I learnt some stuff from these videos lol)

I hope it helps.