What copyright risks I can have by selling t shirts famous Hollywood ppl ? Or simpsonize client?

Statutory damages for copyright infringement are $750 to $30,000 per infringement. You say you will use Flickr images. Someone created the images...

If the only way for consumers to identify the source of the goods was "logo/branding" and it was covered up with tape, and it was only used as...

"Inspired" is often a euphemism for counterfeit. You mention "bought fabric with designer patterns from an online store." If it wasn't the...

Looking to brand a sauce as Surfer Slappin! Sauce. Is this too close of a mark to Billy's Slapp'n Sauce?

You shouldn't want this posted and answered on a public board. Retain a lawyer and get a confidential opinion. A trademark lawyer will consider...

No harm in checking domain names on Whois. It only will tell you if there are domain names for the characters you search and will not give you...

Somebody will have to pay. Find out if the network has a license. In the old days of broadcast networks, they had them.

Can I photograph drawings that were created and printed in 1910, and sell them?

Probably. There could be non-copyright issues depending on content, but with those dates the copyright should be in the public domain.

Can I purchase an mp3 on Amazon and edit the sound quality using Audacity software?

Read the terms of what you think is a "purchase." It's probably a license that permits you to only do limited things. Without a license that...

Can I use or mention copyrighted material in a manuscript?

It sounds like you're confusing copyright (music, lyrics) and trademark (brands). Incidental, background use, that has good artistic reason to be...

What all do I need to make a documentary about a rock star?

You need a license to use the music -- any music. Could you get a music license and do an unauthorized bio pic? If everything is true and public...