I'm not an attorney. Without going into a lot of details here I would suggest you contact an attorney who specializes in trademark law. Depending on how much you have invested in your business, I wouldn't navigate this on my own.

Sincerely,

This is really a question for your attorney but a quick (layman's) answer is that today's copyright protections cover writers almost automatically once you complete and publish your works (research this online). Here is one source of info:

https://corporate.findlaw.com/intellectual-property/copyright-law.html

Trademarks are more related product and service names rather than content and must be applied for.

Sorry I can't be more comprehensive.

One thing I'm sure of is that you have to proactively defend your intellectual property rights. No one is going to do this for you. So if you see someone stealing your work it is your responsibility to notify or prosecute them.

This is a very general question. With the information you’ve given, you should only expect general responses. To give a proper answer one would need to know much more, for example, the size of your business and the importance of each unit.

A few general principles:

Consider an experienced consultant outside of your business rather than hiring another employee. You will likely need very objective hard advice and it’s possible that the advice might include cutting one or two of those business units to help you achieve the kind of focus you need to succeed in a business.

Wishing you the best!