[svenrufus]

I too have used Countryside Jobs Service - can't speak highly enough of them. In fact every job I got in this field, until I became self employed, I saw first in the CJS.
Well worth whatever their subscription is these days.
Otherwise tackle the experience issue with voluntary work until you get your first proper job. It gets you meeting people which can pay dividend later, as well as showing some prior form when it comes to job applications.
As gardnerbr says be prepared for low wages - I lost money over the course of my first job due to expenses I had to face up to to do the work and the low wages, but I still think of that as the best job I ever had because of the experience I got from it, and the fact that it was my 'first job'!!