What shoud I do?

Though you have received good advice it really is not possible to properly answer your question without seeing your mark, seeing their mark(s) and...

Mr Martyniuk has given you good advice - I only want to add that you should look into getting your business name as a domain name and filing for a...

How do I trademark my business name, and what forms do I need in order to do this ?,

You should consult with a knowledgeable tax attorney before attempting this - the IRS does not take kindly to "shell" games and you may end up...

Is it copyright/trademark infringement to operate a website which consists mainly of quotes from your favorite TV show?

You have received very good advice and only want to point out that many people think that "disclaimers" can protect them - this is not true.

As a Small business can I challenge an LLC for trademark infringement?

You have received very good advice and I want to encourage you to hire a trademark attorney to help you - this is not something you should try to...

Can I register a trademark for my product line that was already trademarked but was abandoned and is now listed as dead?

Are you absolutely certain the mark has been abandoned? You really should hire a trademark attorney to conduct a proper search for you.

Is it possible to apply for trademark though another company had registered the trademark-then abandoned it in dec of 2007

Are you absolutely certain the mark has been abandoned? You really should hire a trademark attorney to conduct a proper search for you.

I'd like to start a collection of clothing with a logo collection. Can we use shirts already made by others?

I'm not quite sure I understand your question - are you planning on using something like t-shirts you purchase from a wholesaler and print on them...

Someone is threatening to sue me for trademark infingement....are they just trying to scare me, or is this legitimate?

I agree with the advice you have already received - there just is no way of answering your question definitively without actually seeing the marks...

A trademark i want to use for tshirt printing was abandoned in 1994 per trademark office. Is there a way to purchase old mark?

Are you absolutely sure that the mark is no longer being used? I would recommend hiring a trademark attorney to conduct a search and if the mark is...