You live in England? When you say you finished school, do you mean High School?
I live in the US, in VA.
Maybe someone can answer your question who lives in England.
But for now, here in the US, we have State Employment Commissions, or similar, who have job openings, and take applications for jobs. They also give information to employers, with your qualifications, and try to set up job interviews for you.
Do you have anything like that, where you live?
Best of luck.