I need help on getting a british accent.?

I want to talk in a british accent but I don't know how. It seems hard. I am spanish. My mom is puetrorican & my dad is mexican. However, I was born in Tampa, Florida. Nice mix huh? Lol. Anyways, I don't speak much spanish but I am going to learn. I want to speak spanish, french, and italian. I obviously can speak english(: Any tips on accents? I also want to do country and russian. But I'm focusing on british right now. Is there some type of class or anything? Please help! Thanks ! :D