I'm done the netflow configuration for our fortigate firewall interface (external physical interface), i refer from the web below 

https://blogs.manageengine.com/network/netflowanalyzer/2014/11/12/netflow-on-fortios.html

http://kb.fortinet.com/kb/documentLink.do?externalID=FD36460

but im unsure what next to be setup on Netflow, can someone help me

Thanks!