FreeBSD 5.4 with no Firewall?

I'm moving my server to a colocation.  Its a web-server (Apache 2.0) on
FreeBSD 5.4.  Should I get a gigabyte firewall first?(I plan on getting
one soon) How important? What can I do to help secure the OS its self?
Any built in programs I should install first?

Thanks for any Help
Ben

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