About Report center site

All

I am a newbie for SharePoint product and would like to ask you some question.
1. I now try to develop the sharepoint site on WSS 3.0 and want to create the dashboard page. AS I understand, it bases on MOSS template "collaboration type" (Report center site) but that template does not have on WSS 3.0. Where can I find it?
2. What is the big difference between WSS 3.0 and MOSS 2007? It will have any problems If I try to some site on WSS 3.0 first. I then migrate those sites to MOSS 2007 later?

Thank in advance
Gogzilla

[567 byte] By [gogzilla] at [2007-12-30]