Well, I was pretty lucky. A friend of mine started modeling before I did and helped me get going through the site that she uses. However, there are actually a fair amount of legit sites to choose from. Some of the ways I can tell a site is legit include the following:
(1.) They make you send in a photo ID of yourself, then make you show your face on cam, so they know the person modeling is the same person who applied for the gig.
(2.) They verify that you are at least 18 years old, through the paperwork they require you to send in.
(3.) They don’t claim to pay through PayPal, since it’s against PayPal’s terms and conditions to be affiliated with adult-oriented websites.