Help with iptable / logging for a newb

Hey there. I'm running a Plex server and I'm trying to setup a wake-on-LAN script with my Tomato router so that the server can sleep until a Plex client tries to access it (within the LAN only; not interested in WAN). I'd post a link of where I found the code I'm using, but as a new user here, I'm not permitted to submit a link.

I've placed the following code into my firewall script section:

#Rule to log all new connections on LAN for the plex server for the WOL script to trigger
iptables...

Help with iptable / logging for a newb