Silver 4 is a great place to start. It's more conducive to learning than bronze and is also easy to climb out of once you learn the game a bit more.
League is a skill based gambling game, much like poker. Think of each game as a hand of poker. Some games, the cards you're dealt aren't great. Sometimes you can't win with the cards you have. Other times, you may have a stuffty hand, but can still win by making smart plays. Sometimes, you'll get a royal flush and you could go 0/20 and still win. Your own personal skill and understanding of the game can influence the odds to be in your favor, but mostly, it's improving your own play and grinding out more games that helps to climb. In the end, it's still a gambling game, so don't get discouraged by loss streaks/initial placement.