Welcome along. Lots of info in the 350z FAQ section. Here's a good thread for starters
http://www.350z-uk.com/topic/22880-guide-for-new-memberspotential-buyers/#entry342117
Had a mildly modified CLK before the zed myself, and since selling the zed I'm now in a skyline r33. The zed and the skyline are both great but in different ways. Love the skyline to bits but I will do well to own a car I love more than the zed, was a great all rounder
What mercs have you came from?