There are many fitness machines available in a good fitness center. Most of them work one specific body part, but can be adjusted to work that same part from different angles and can be adjusted to use heavier or lighter resistance. Many gyms strategically set up their equipment to move through each station as efficiently as possible. Most machines will have an exercise guide attached that will explain how to perform the exercise and will also detail which body part is worked.
Set realistic achievable goals. Do you want to lose excess weight or do you want to build large, well-defined muscles? Do you want increase your overall endurance or increase your overall strength? Once you have made a decision about what you would like to accomplish, design a program that will help you achieve your goals and will be interesting enough to keep you engaged in the process.