Hello: No matter where you are, it's the same. The most important thing in patent application is patent retrieval. When choosing a patent application institution, you should pay attention to its qualification, whether it is a formal institution registered in China National Intellectual Property Administration, and whether the professional background of its internal patent agent is the same as or similar to the invention field you want to apply for. You can investigate the number of cases they represent, the authorization rate, whether they have served large organizations and so on.

I hope it will help you, and I hope you can adopt it.