In order to get into modeling, you should first contact local modeling agencies. Most agencies have open calls, which is an opportunity for prospective models to come in and audition for the agency. It is also possible to submit an application online to some agencies.
If you want to improve your chances of being accepted into an agency, it is important to have a good portfolio to present them with. Within your portfolio, you should include professional headshots, full body photographs, and examples of your work (if you have modeled or acted in the past). Also, it is very important that you have a good attitude and are personable, because you will likely be interviewed by quite a few agents during your search.