Not all gyms are set up for body building--some lack the right equipment. Look at a bunch of gyms before you make a final decision about which gym to use. You want to find a gym that has regular body building clients and customers.
You also want to find a gym that has good lighting and is very clean. You want the equipment in your gym to work well and be in good condition. The gym you choose should have a good vibe about it. If you don't like spending time there or using the equipment you won't get your money's worth out of your gym membership. That will put a damper on your body building efforts.
Set reachable goals for yourself. Don't try to get super ripped super fast. Focus on goals that don't work against your health. This way you will get the satisfaction that comes from realizing your goals and seeing them come to fruition.
When you succeed and meet your goals you can set new ones to reach. Step by step goal setting will hep keep you focused on the tasks at hand and keep you from trying to do something dumb or take a shortcut. Always remember: your muscles need to be strengthened before they can be built. If you try to build up too quickly it will be easy to hurt yourself of feel helpless about being able to meet the goals you set for