Clara wrote:
Most importantly make sure you know how to use a chainsaw properly before you even start.
unless you are not planning on using a chainsaw. we don't - have been laying hedges by hand, using bow saws and bill hook
I advise contacting a local nursery (the kind that supply hedging trees etc, not garden centre... local council have a tree warden who can point you to someone) - try Perrie Hale in Devon, and talk to them about the area you have in mind, how water logged it is, high etc. and they will be able to give you infor on the right type of trees to grow