Your adventure begins at the Entrance of Dracula's Castle. After the initial cutscene, you'll gain control of Jonathan and Charlotte. Head right, defeating the first few Zombies and Skeletons. Familiarize yourself with the basic controls. Continue right until you reach a large room with a Save Point. Save your game here. Proceed upwards through The Great Stairway, battling more common enemies. You'll encounter your first painting, 'City of Haze', but you won't be able to enter it yet. Continue upwards and to the right, eventually reaching the Master's Keep. This area serves as a central hub for the castle.
