It may be worth adding that some clubs include 3 months membership in the price of a trial flight, so you can enjoy some flying at club rates before you have to pay for a full years membership.
As a guide my local club offers trial lessons for £75 which would include two winch launches. The same two 10 minute winch launch flights would cost about £28 in total at club rates.
Definitely mention your experience. There are different levels of instructor. Someone will correct me, but I believe that basic instructors are not allowed to give the pupil control below 500ft and that isn't what you want!