If you want to be a fashion model, you have to know the general physical requirements to be a model. Some of the top agencies will make occasional exceptions, and there are also plus sized divisions if you’re more suited for that type of modeling.
If size is an issue, there are articles on the web about what models eat that will help you improve your skin and tone your body!
There are some great resources on the web that teach you how to submit your photos to agencies and what to include when taking those photos.
Also, amodelsguide.com has some great information and resources, including an FAQ if you have any questions the site doesn’t answer.
Please be careful of modeling scams and stay safe and stay informed!