First of all, you should determine the direction of your graduation project and what you want to do. Don't worry about this. You can ask the teacher to help you decide a topic or choose a topic in your favorite direction, and then you have to prepare. You should consult relevant literature and graduation projects done by others before to understand the background of what you want to do, whether it is conceptual design, innovative design or improvement of the original things. You should also understand his development prospects, which should also be written in your paper.
After that, it will be done by hand. First, you have to draw some sketches, and then use some software, such as 3D, to make a model you want to make, and then make the model by hand. Of course, many of them are made without actual samples. Such as interior design. Finally, write a paper. A thesis is to write out what you have done. Finally, we should prepare for the defense, do a good job of PPT and exhibition board, and show and introduce our graduation design to the teacher through the model and exhibition board during the defense. This is basically it, hehe.