If you found the Miffy lecture among the free lectures a bit difficult, I think it would be good to try making a room first! That lecture was designed a bit more for those who are new to it. Since it's a lecture where you can ask questions, please feel free to ask if there's anything you don't know. Hearing you say 'I want to try it' makes me feel so proud and want to cheer you on greatly! I hope you continue to enjoy studying Blender :)