In lea-mans terms what are tubulars, clinchers, and what is a standard wheel tire called?

I have a 2009 TCR advanced (105 components) with mavic cxp 22 and Michelin pro 3 tires

I have the opportunity to pick up locally a very lightly used Pair of Zipp 404's Tubular wheels, ZIPP skewers, Zipp carbon brake pads and 10 speed cassette, for $600.

How much of an upgrade would it be for me. I ride daily and like to go as fast as i can, and weekly club rides. I'm 45 185lb