Port forwarding and routing are not FreeBSD-specific topics, but general networking topics on which there are many books and online articles.
As for qemu, you might find the FreeBSD handbook chapter on virtualisation of some help, though it's not qemu specific (it covers Parallels, Zen, Virtual PC, VmWare).
How you arrange for ports being forwarded depends on which firewall you decide to use, as there are currently three available in FreeBSD. You should start reading here:
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