You don't need to prepare your questions beforehand – you don't even need to type them in, unless you want to. Ask the questions verbally in class, show them on the projector, or whatever suits your style. Clicker collects the answers, which can be either YES/NO or one of up to 5 alternatives (A/B/C/D/E).
After each question, you and your students will see the results on your screens. And when you end your Clicker session, you'll receive an email with the results for safekeeping.
Let us know what you think: firstname.lastname@example.org.