Is creating an unofficial eSports game fair use?

Possibly. What you need to avoid is presenting any false association, sponsorship, endorsement or other affiliation with this other enterprise. And...

You already seem to know the answer. You are free to write about anyone you like. If they are or were a famous person then you will not need to...

Can I use real world car models with hidden labels in my mobile game?

Assuming you are not presenting any false association with any given entity or trademark holder this may not be an issue. Before you commit to...

Can I start a catering business only handling the logistics without telling the kitchen?

The concern here seems like it might be trademark or more precisely something called reverse passing off. This is when you just remove the branding...

Can I trademark a custom logo variant I created designed for the area I live?

There's a bit going on here. The acronym itself may not be protectable if it is just a generic descriptive for a geographic location and also note...

I have a great idea for my company, as a marketing tool. What steps I need to perform to get this idea out to many companies?

Ideas are not really protectable in a vacuum. For example, a patent protects the how not the what. Before you discuss with anyone, I suggest...

I am a book seller on AMAZON a third party has hijacked my listing and takes $7 from any sale of my book.

The details are not very clear, but it sounds like this is really a litigation matter meaning you may have to file suit first before you can demand...

Suing author using a book series similar to one I have trademarked

There would have to be more because the title to a single creative work is not afforded trademark protection so the question is going to be whether...

I don't think this can be addressed here without a better understanding of what you have in mind. The general format of a program really cannot be...

Is it okay for me to make shirts with rugats or my favorite cartoon character if I change the design ?

Merely changing the design will amount to a derivative work which is an infringement anyway. Unless I'm misunderstanding you, which is possible,...