Working in Spain

Hello;;
Im thinking about working in spain for a year. I have an A in GCSE for spanish and I will be taking it for ALevel soon (Exam boards/stages in England - [GCSE taken at end of year 11[16years old] and Alevel at the end of year 13[18years old].
It wouldnt be untill 3 years away; as I will be attending College for 3 years and not 2 [Hehe life story sorry!]

Basically; I was wondering if anyone can advice me on what to do etc. And if anyone else has done this.

Thank you for reading
Takee care