I know David Wheeler did a nice piece of work on secure programming (http://www.dwheeler.com/secure-programs/) you might find it useful. Also, I remember a great lecture of dr McKusick on a BSD Conference, and a video from it should be available somewhere on this page...
Sure, pfctl will allow you do do everything you want. Also, check out the PF faq.
http://www.openbsd.org/faq/pf/index.html
Tons of great info. For example configurations, check out the pf repository at
https://solarflux.org/pf/
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