Everything Airbrush Tattoos

I want to be a model, I reckon I have the potential to be a model, it’s just i’m not amazingly sure how i go about becoming one. I know I need to get a portfolio together. My dad is a Photographer so that side is taken care of. But can anyone give me any excellent modeling agencies? Or sites to find one that suits my needs. I also have a tattoo of a star on my elbow. Do you reckon that will be a major problem for me? I’m aware you can get make up to cover it up, or it can be airbrushed. Thank you very much