These are all necessary conditions for your study. Where to learn two methods:
Find a vocational technical school first, which is a relatively standardized system, but it is of little use to your preliminary work, mainly for post-design. . But it's better to learn some.
Second, if you work in the factory for a period of time, it will deepen your understanding of design skills and techniques, but it will not help your design much, because the factory is practical. .
Back to the topic, there is no series of training and study in this field in our country for the time being, so there is no complete study plan. . Moreover, the research in the early stage of design is very important and expensive. I suggest you go to a college specializing in fashion design first. They may provide corresponding internship opportunities, which may be far from your luggage design, but the foundation is universal.
If you are smart, you can go directly to the company that produces bags to promote your design and practice your true knowledge. The above has provided you with the knowledge you need to master, depending on how much you can understand, it may not be comprehensive enough.