Hi Wannabe,
Research on Prune is all good, but I would go to your nearest flying school (and also a couple others) that offers commercial training, find an instructor, and ask them all these questions. If they are a half decent school they will give you good answers.
Seeing as your location is Essex, that would mean Clacton EGSQ, Andrewsfield EGSL, Stapleford EGSG, Earls Colne EGSR, Southend EGMC and at a pinch Duxford EGSU. I probably missed a couple.
