A lot of people are going to tell you to ready guides, watch streams, ect. My advice to you is to take these with a grain of salt and use them as guidance for ideas, not as a template of how to play.
Game play is always changing (so you cannot rely on one form of play consistently), and the best way to change with it is through personal experience. Just play the game however you see fit; however, as you play be sure to consciously note what you are doing, what your teammates are doing, what your opponents are doing, and (most importantly) what effects are happening as everyone is doing these things.
After your game, take some time to lay down and seriously think about what happened during your game, what effects it had throughout the game, and why it lead to the end result of the game (regardless of winning or losing). Try to make sense of everything (especially if it doesn't make sense). Note what was good about that game (from you, your teammates, and your opponents) and try to incorporate that into your next game. At the same time, note what was bad and actively try to avoid that.
Repeat this process. The more you do it, the more you will refine your play and ultimately become better at the game.
Or throw this all out the window and YOLO SWAG, I'M DRANK DRUNK AND ITS MY TEAMMATES FAULT (but we all know where this gets you).