Network sharing "Question"

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http://forums.fedoraforum.org – Hi, I'm trying to set up connection sharing in fedora 15 to a windows machine I have the following set up Modem to Router Router to Linux machine "Wifi" Eth0 set to share the connection. I get Internet on the windows machine no problem, then issue is when hosting a game server on the windows machine no one can connect to my server, by my external ip. I've been reading information on using the Linux box as a gateway using iptables and MASQUERADE but I wouldn't know where to start. any help would be greatly appreciated! Kindest, regards (HowTos)