Let’s focus on a blog for parnasa.
You have to deal with the lack of privacy. There’s an interesting book, My Oprah Year, about a woman who I guess you could call a stunt journalist (check out A. J. Jacobs for more of the genre) who tried to stay anonymous and it reached a point where that was impossible.
Do you have a skill?
Do you have a funny idea? I saw a few books this year, Awkward Family Photos, and Cake Wrecks, that started out as a blog someone posted, more people sent in their own pictures, and soon it snowballed into a book. I have no idea how much these people have made off the books. (I saw a cute thing in Reader’s Digest, one of these little fillers, this one about misused quotation marks. Sure enough, it came from a book about quotation marks. )
Do you think you’re the next Erma Bombeck, or human interest columnist? I would tread carefully. Leaving aside the frum stuff, like lashon hara, it’s really hard not to draw on your personal life in personal, obvious ways, and not only do you not want to lose your privacy, but you don’t want to alienate people.
And hey, I’ll bet there’s a blog out there about blog start-ups.