1. if you really are from the future and your telling people in mass numbers that your from the future wouldn't you be violating several Temporoal laws that prohibit such contamination of the timeline
That depends on the timeline...
There is more then one future timeline out there. Physicists already know this today, in 2004, even though they still don't know for sure if time travel is possible. Just check any current popular book on modern physics (look for a description of Everret's "Many Worlds Theory").
Since all possible futures are, in a sense, out there, there are some future timelines where time travel is heavily regulated and others where it is not. There are even future timelines where time travel has never been invented at all... All this assuming, of-course, that building time machines is allowed by the laws of physics (as of 2004, this question is still open).
P.S. If anybody is wondering - time travel is possible. You can trust me on this one.
3. if your truly from the future why have you chosen to come to the 20th century, what purpose does it serve
This is the 21st century, not the 20th.
And you got to admit, this time period is among the most interesting ones in the history of civilization. No other century, in the past or future, is likely to be as eventful and revolutionary as the 21st.
4. if you go around telling people your from the future how come you then don't produce any Physical Evidance
New York will be chosen by the committie in July 2005.
5. you never tell how you mad the trip
Of-course not. After all, I'm not a time traveller...