I'll ditto what Glenn said about going where the work is, with a couple of exceptions... First, I differ from his opinion about glamour and commercial not being the same, and one being more prevalent in LA than the other. Backing up a bit, the other major type of modeling is fashion, and everyone knows NY, and seasonally Miami, is where that work is, although there is a moderate amount of fashion (catalogs and shows) in places like Dallas, Seattle, Chicago and San Francisco, as well as a huge market in LA (probably second only to NY and ahead of all the others). Remember though, to really get started in fashion in NY, the female model needs to be young to get started (14-19) and tall (over 5'9"). In the non NY markets she can get away with being a little older, but not much shorter, although in LA we have a lot of catalog work for fashion models in the 5'8" range, and age can be up to 21 (if they're starting out, if they're older they're expected to be experienced).
In my opinion, glamour is simply a sub-set of commerical modeling. Commerical models pose for anything where they're not selling clothes or fashion. Cars, orange juice, electronics, beer, accessories, home furnishings, travel, etc, all examples of commercial modeling jobs. They can be used to illustrate something in a magazine, or a POP poster, or a catalog or billboard. Now if the modeling job is for a company that wants a "Maxim" model type look, they take a commercial model (some are sexier-looking than others to start with) and dress her up like a Maxim girl, and bingo, you have a glamour model. Whether she's busty or not, tall or short, older or younger, makes no difference. Glamour is a description of the look you're achieving. Some people use the term "glamour" to define an adult or nude model. I don't, but it makes no difference for the purposes of your question. Commercial and glamour (and adult and nude) models can find a lot of work in LA, although there are a lot of models here competing for it.
One thing that gets lost in this age of internet models and internet modeling agencies is that most bread and butter modeling jobs still get booked by models living in the city where the job is, by a modeling agency with an office in that city. On any given day here in LA there are probably dozens of casting calls for modeling jobs in fashion or for commerical products, and those clients and photographers are not looking for their models online.
Andy Pearlman Studio