What else do I need to start using Adobe Captivate?

Hello! I’m going to subscribe to Adobe Captivate and am likely to enroll in the training for beginners with the intention of getting the Adobe Captivate eLearning Certification. With that, besides subscribing to AC, what else do I need? What about images or graphics? Are these available with A or purchased separately? Different source? Any insight and advice are sincerely appreciated – thank you!