How am i supposed to get to platinum at flex?

Tedo58 - Summoner Stats - League of Legends
Tedo58 / Gold 4 29LP / 57W 57L Win Ratio 50% / Yasuo - 3W 2L Win Ratio 60%, Aatrox - 2W 2L Win Ratio 50%, Urgot - 0W 4L Win Ratio 0%, Graves - 2W 0L Win Ratio 100%, Kassadin - 1W 1L Win Ratio 50%
I'm already at gold - plat mmr and i'm just at bronze 4 due to getting in Iron 4 after playing the first placement match. By the time i hit silver i will be playing with plat - low diamond how and to get to plat probably ill have to beat master players which seems kinda absurd this new system seems so all over the place.
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