If I sell a plain white bib, and someone asks that their college logo be added to the bib, is that infringement?

Yes it is.

I run the website mcdonaldspeople.com and wondering if I am open to copyright/trademark infringement suits?

That depends on the contents. McDonalds is a last name and nobody has exclusive rights to it. So if your site is not about products of the...

Is it illegal to pgoto copy famous people on the internet and then sell for profit

yes it is illegal, unless you have their permission.

No, it would not but it would possibly be trademark infringement

yes, short and sweet, isn't it?

Could A writer self-publish a book about a brand, such as "Campbells Soup Company: The Brand That Conquered America"

yes you can. and you can publish your opinion, good or bad, about it too.

Enough that there are no recognizable similarities to the common eye with the original Logo.

I have trademarked my name and someone else is using it what do i do?

If someone is using your name to identify a product/service in the same class you use to commercialize your product/service, then you can sue for...

Is cataloging quotes found on the internet, attributing the source url, and then printing in a book infringing copyright?

Depends for what purpose. Depends on the quote. Is this for news? for profit? for general info?

Is this copyright infringement?

There is a difference between the medium (the fabric), the copyright and the trademarked logo. You can resell the fabric as is, under the...