If you are interested in modeling, make sure to look for reputable agencies. There are some dangerous people out there who try to take advantage of aspiring models. Since you are in CA, you can look at some agencies in Los Angeles. For example, the website LAmodels has a tab labeled "Become" with instructions on how to submit your headshots. If any agency asks for a meeting, remember that you can always bring along someone you trust. Good luck and be safe.
You need to find a modeling agency and fit their requirements for employment. Then they will send you on specific modeling jobs to build your portfolio and get you out there. sign up for any fashion shows even if you work for free you can get pictures that will also build up your portfolio it will show that you have experience. also take a class in make up/stage make up so you know how to be “camera ready” for job assignments.