you are in a good part of the country for starting trialling as there are several clubs within 30-60 minutes drive away that hold trials with route suitable for beginners.
"Manchester 17" hold a series of "dead easy" trials with two routes, an absolute beginners route and slight harder (but still relatively easy) route.
Their dead easy series starts again on Sunday 3rd April at Victory Quarry near the outskirts of Buxton. They are a firendly bunch and there are always plenty of new riders there.