apply for a trademark yourself first. If it is a new invention, you should apply for a patent. Patents are different from trademarks. Just ask an agent to do it for you. A trademark of 15 will do, and a patent will cost thousands.
if you are sure that you can make money, you can set up a production factory yourself, but the cost is higher.
you don't have to do QS first. You should build the factory first, and wait until the company has a certain scale to do QS. I won't talk about the details.