Ask How do you set up a trial period for a membership site?

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I want to offer a trial period for my membership site but I don't know where to start. Can it be free or at a discount? How long should the trial last? I also worry about people signing up just to cancel before paying. Some sites ask for payment details upfront while others don't. I want a setup that attracts real members without hurting my business. What is the best way to set up a trial period for a membership site?