I went through
www.dotauthority.com and they did everything. I had my authority pretty quick and it was painless.
As soon as I started running in November of last year I went on the load boards and no problems getting loads and no problems getting paid.
I contacted OOIDA in the beginning and they offered nothing of value to me being a new person. They wouldn't even answer simple questions and ignored my emails. I called them and pretty much got the same.
As far as time tested brokers, forget it, you'll starve unless you know someone with about 10,000 names. Use the load boards like a lot of us. If they don't pay, they are reported and it reflects in there credit score on the board or they are thrown off.
This isn't rocket science, same principles as running a taxi, just more expensive but the basics are the same.