Bro, as a beginner you’ll hardly being flamed, as you’re likely to play with other newbies that also don’t know what to do or how to play the game. My first months of League some of the best aswell, zero flaming. Flaming starts as you learn and improve at the game and start playing with people who think they know how to play the game. LoL is a great game, keep playing it light-heartedly and you’ll have a lot of fun and good memories
As a beginner just play many champs. Play whatever draws your attention and if it’s cheap, like Garen, even better