There are a couple of things you should consider as you embark upon your fitness journey: what are you goals, what are your likes, and how can you best equip yourself to meet your goals?
What are your goals?
People exercise for many reasons: to lose weight, to tone their bodies, for their overall health and prevention of serious diseases, for the social aspect of interacting with others or to get out and explore the world. And to meet those goals, you should be able to say what you're hoping to get out of exercise; that way, you'll be more likely to stick to your plan.
What are your likes?
One of the greatest things about exercise is that you can get it in so many ways. Think about the activities you enjoy, then figure out how you can incorporate them into a workout routine. If you're unfamiliar with the variety of activities you can do, ask the trainers at your gym or friends who have been active longer than you have for some ideas. One thing to keep in mind: Just because your friends like an activity doesn't mean it's for you. So take the time to see what's out there and what you'd like to try. You have so many options; why not try them all until you find the exercise plan that best suits you.
How can you equip yourself to meet your goals?
Once you figure out the actives you'd like to participate in, do a little investigating into the gear you need. You can go to class like clockwork, but if you're wearing the wrong shoes or improper clothing, you can put yourself at risk for injury. Talk to a trainer at the gym or a professional about any activity-specific gear you may need.