Always, Always, Always clean, inspect, and lubricate every firearm before you take it to the range to shoot. It may not always be absolutely necessary but, it'll sure boost your confidence when you pull that trigger for the first time. Besides you would be surprised at some of the things you could find wrong with a firearm. It just makes sense.
Think about the embarassment it prevents, that alone is worth the few extra minutes of preparation, and by all means take the magazines with you to the range. You would not believe the number of folks that come to the range without them or bring the wrong ammo.