How to Cent. Gloriana?

Hi, I recently bought the Centurion Gloriana and so far I haven't been able to perform well with it. I've been out of the high tiers for a long time (Around 6 years?) and I mostly have been grinding crews or playing my favorite tanks but yesterday it wasn't my day.

I played 10 battles, only won 1, got destroyed in 4 from team going to one side and leaving one wide open, 2 from instant focus (Was moving, tracked and bam!) And didn't know what to do in 3 since I don't have too much knowledge of maps or the tank.

I'm used to play french mediums or light tanks and the Gloriana is strange, It's not fast on dirt but has an okay gun, a good depression and okay turret armor.

Any tips on how to drive the tank? I was researching the medium UK line back when it came (A long, long time ago) but stopped when I got the Comet since it was too different from the Cromwell or the USA mediums (I drove the T20).