Can a 15 yr old sketch artist obtain a seller's permit in CA?

To my knowledge, there is no age restriction involved, but even if there is you as the parent can certainly transact on behalf of your minor child....

Is it illegal to sell a team's jersey with an unregistered (thus far) trademark customized on it?

If you are buying a jersey and customizing it for your own personal use then that is not a problem. If you are doing this for commercial resale...

Can i buy a perfume in a regular shop, made small qty of it with the original name give it for free to any of my subscribers ?

There really is no actionable violation with buying a product then breaking that down into different quantities and selling it or giving it away....

Merely creating an illustration of a performer is not a violation of their rights if it is sold as original art. It would be a problem if you use...

Do I need permissions for using quotes/proverbs and idioms in a book I am self-publishing?

Using quotes will generally be permitted. This is largely because using what amounts to a very small portion of a much larger body of work will not...

If it is just incidental to the video and not a focal point or presented in any way that can be perceived as a false association or endorsement I...

What can I do to take action against using my photos for commercial use?

I think one can easily infer here that you gave consent (implied or direct) for them to use the photos for promotional use such as their website...

Does it Violate any laws?

IN theory, so long as you are not a party to any agreement that says otherwise you should be able to sell any lawful product in the US. Before...

Can I register a doing business as name that is the same name as a different registered business other than the "Inc." ending?

Yes, so long as using that as your DBA is not causing or is likely to cause any market confusion. So if you are both in very different industries...

Could you get arrested for selling "love spells" online?

I assume they would need to be properly disclaimed as entertainment, but otherwise I'm not sure why that would be unlawful. If you need...