Here’s several things to look at:
Michael Lucas’s “BSD Needs Books” talk from NYCBSDCon 2010, on Youtube. I’ve talked about it before because I saw it in person; it’s a good talk. Ironically, he talks about getting a publisher interested in your book, and he just self-published.
Hubert Feyrer linked to the slides of two pkgsrc talks at FOSDEM; one about bringing pkgsrc to MirBSD, and one about pkgin, which is included in DragonFly.