As a complete beginner the gym can certainly be an intimidating place. This is why I suggest hiring a personal trainer for a good 8-10 sessions (at least) so that you can learn what muscle group(s) each piece of equipment works, as well as proper exercise technique, breathing patterns and rep cadence. A good trainer will also help you develop a workout program that is suited to your present level of fitness, particular goals, and that addresses any injuries or limitations that you may have.