I need tips plz :D

I want to get at least gold this season, so im doing my best on rankeds, but i notice that im not so good at doing strategies. I know that i need to farm, the runes for each champ, the masteries, that when i push i can go to other lanes, etc. Can you help me giving me some strategies to win please :D? And thanks for your attention!! :D

PD: What should i do here xd? (the image)