Since last time I install php-fpm in my freebsd box I still looking way to make virtualhost. I think its not easy to make vhost in nginx but I’m wrong
Just add :
server {
directive
}
will add new vhost.
Full sample from my vhost :

server {
listen [...]

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I’m bit lazy to read manual and prefer to read it as a case. Nginx is my favourite now, by collecting related tutorial, blog posting and articles I hope I can learn nginx more.
Links I found so far :

Reverse proxy in depth tutorial
Step by step install Engine X (nginx) and php-fpm in FreeBSD
Dreamier Dream Server [...]

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