I'd say start playing for fun--play 5 games to get a feel for the game and how it works.
Then, look up some beginner introductory videos.
There are some good series / guides that teach you different aspects of the game. Just watch videos, pick up skills slowly. Play games with the intent to understand/practice those.
Always ward, watch high elo stream because you gonna see staff that you never learn from low elo games, and thats gonna make change in your playstyle and you gonna get higher rank