I'm plat 3 but have been plat 2, but the best way to learn is to play, and i feel like ranked is the best place to learn because you get to pick bombside and spawn place, you don't need to listen to those get to lvl 100 lol, but callouts would be a good thing to read up on.
Anyway just play, if you derank it's because you don't belong in the rank you are in and you will drop down till you are at the right lvl and then you can start your climb! anyway good luck oh and if you are in EU we can try some games a couple of times if i'm not busy with world of warcraft haha