down the shore (dts)!
Stef:
As for where to start it really depends. Like the other said I wouldn't suggest Ballys. I've known people who have worked there and they did not like it at all...I don't remember the exact complaints, but it was mostly about the environment. The calibur of trainer at most Ballys is usually subpar. I had a friend who was offered a job because he 'looked the role' but didn't really know a lick about lifting...to this day he hasn't worked his legs.
NYSC/PSC (Town Sports) is another option that you have, but from what I've heard is their career development is pretty much non-existent. Some of their trainers are not cert'd (shh) and any courses or continuing ed is pretty much on your own...There is no educational aspect to it.
I would mention Equinox, but there aren't any DTS...The problem is that if you're looking into a big commercial gym, that's what you're going to get. Managers who are more concerned about hitting their monthly/quarterly bonuses than they are about you being a good trainer... Which is all well and good, but if you stumble a month or two, watch out.
What I would suggest is taking a look at first what is available in your area. craigslist is a great place to start, followed by the local sunday paper. Submit your resume and cover letter to a whole bunch of places...you'll hear back from them within a week usually. Most places will set up an interview, and if you ask will allow you to come in a few days before for a free workout so you can see the gym, talk to members/trainers, etc. This will give you a chance to see if you'd fit in and really like it there.
Hope this helps, if you have more specific/personal questions, feel free to pm me.
By the way, welcome to the board!