Thanks for the input guys and gals!
Per Shade & Pixx's comments, they always say, "Focus and work on those things you know and like best and you will be successful."
Which is also why the first site I'll probably tackle will be SoCalMilfs. Based on the number of views it's getting while parked (though I'm sure some of this is 'cuz of having posted the names here), it's seems like the best candidate to develop and cut my teeth on - but then again, maybe I should start with one of the other ones and make all my mistakes there before trying to develop what looks like the best name of the bunch.
I don't know, I'm so confused...
Thanks again!
Ps. Keep those thoughts and suggestions coming, this adult stuff is still all new to me.