It is recommended that you apply for utility model and design together.
However, before applying, you need to conduct a patent search, that is, a novelty check to see if there is a similar patent before you apply. If not, you can communicate with a regular local patent office and entrust you to apply for a patent.
Another problem is that if you apply for a practical application, you may want to pay attention to the rights requirements and not be too small.
After a patent is granted, it does not mean that it can be converted into profits or money, so you must be mentally prepared.
If you have not applied yet, it is recommended to keep all your research materials and do not give your drawings and the like to the company easily.