I agree with loopfitt. I’ve seen trainers with one or two certifications who are exceptional, and I’ve seen trainers with five or more who suck. The certification isn’t going to make you a good trainer. What you read and put to use through trial and error…keeping in mind that proper technique is a given…will make you a good trainer. To make money you have to have clients, and to keep clients you have to know what you are doing. So, get a national certification, and continue reading stuff on here and elsewhere.
I’m going to put a plug in here for a certification that I have. The NSPA is a national certification with it’s offices based out of Maryland. I found the course to be pretty comprehensive. It went over quite a bit of programming etc… Where as ACE covers more of the legal aspect, or that is what I’ve heard from trainers I know that have an ACE cert.