want to start my site as
how can i do that ?

I think they started discontinuing the sitebuilder…
but they officially stated in their email message that they will stop clients (us) from adding new SitePro (Sitebuilder) sites.

Here is their Timeline
(1) May 1 - No more new sitepro sites.
(2) June 16 - No more Sitepro editing, publishing and etc…