How to write the file `nginx.service` on centos 7.2?

There is an example of mysqld.service, http://superuser.com/a/384525/577295

I need nginx.service,so I imitate it and write like this:

[Unit]
Description=Nginx Server
After=network.target

[Service]
ExecStart=/usr/local/nginx/sbin/nginx --defaults-file=/usr/local/nginx/conf/nginx.conf  --socket=/var/run/nginx/nginx.sock
User=nginx
Group=nginx
WorkingDirectory=/usr

[Install]
WantedBy=multi-user.target

but I'm not sure whether it's right or not.