Welcome, Alex. :)
It's understandable that you have many questions and are unsure as to where to begin. As for what to expect with the various PSO companies out there, the best thing I can suggest at this stage for you is to take some time to read through the company review sections/forum in the Good/Bad/Ugly thread. It will give you some sense of which companies might best fit with what you have to offer.
I have a few questions for you to ponder, actually. I'm assuming you have not worked as a PSO before...and that's totally ok. There are many companies who don't mind hiring newbies with little or no prior experience. But, what I wanted to pose to you, is, what made you decide to get into the PSO business? What sort of experience do you have already that might be able to be transferred into this line of work? Have you ever worked in the adult industry in another capacity? How would you rate your writing skills? How good at you at thinking on your feet?
You mention being a single mom...are your children old/responsible enough to be able to be left unattended while you're on the phone? Do you have childcare set up if your child needs supervision during your work hours? (If you are willing to be logged in 60-ish hours/week, I believe most companies would consider that do-able; some PSO's do work more than that, but 60 hrs/week sounds good to most managers).
These are very likely going to be questions a PSO company/manager will ask you on an interview. Before you start applying, it would be good for you to be able to have answers to the above questions I presented. Once you know those things about yourself, it will be easier to narrow down which direction to take next.
Hopefully, this gives you some things to think about...and congrats on taking the 1st steps toward beginning a career as a PSO!
For your PSO blogging/written content needs:
Wayward Museshttp://waywardmuses.com/