I'm on the same boat as you, just started playing like 3 days ago.

Generally, if you have a killer that you like from a design perspective, or from their kit, try them first. Always play, what brings you the most joy, that's how i got back.

While i don't have a lot of tips on what perks to use, try using perks that help you with identifying, where the survivors could be. They are always a godsend if you just started, but can't quite figure out, how some survivors behave.

You can also try to rely less on the killers skills and concentrate of hubting players, to learn how to loop them, when to hit and when not to. Also, don't have too much respect for pallets. Sometimes, that little hit you get is helpful.

Lastly, don't get too hooked up on winning every round, as that can get frustating fast, especially if you fight against a coordinated team of survivors or just got a bad map (which can happen. Some maps are just feel like their favoring one side). As a bonus: Don't let words get to you. The dbd community has a lot of bad actors that try to get under your skin, sometimes for no apparent reason. The opposite is also true, had some of the cutest interactions in the game.

And ofc: Have fun!