I would make sure that you have a guide book or an app that shows you where the climbs are. Start with the easiest problems, and don't do any highballs (problems over 20ft) until you get used to topping-out and falling on crashpads. Do some traverses. Make sure you have a great crashpad! Like what @rabbitfeet said, go outdoors and enjoy being in nature and in good company. You won't be able to send that many problems on your first day. But, you'll get stronger, your skin toughens up, and your technique/footwork will start improving. More than anything, climbing outdoors trains your mental game, which benefits any kind of climbing.
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