Video types

I downloaded a 30 section of a video from a DVD my compaby produced and I have been asked to put it on our companu web site.

(1) In what format do I have to convertthe video clip into before I can stream it from the web site? There seems to be tens of options and being in New Zealand we use PAL but I don’t know which one to use.

(2) What do I need to be on our web server to stream video so its not savable to a viewers PC but can stream on-line?

(3) How do I set up streaming video on the web site?

Thanks
bruce