Honestly, how do women and girls as the leading ladies or just one of the cuties get on music videos 10 points?

First of all young lady, your skin tone has nothing to do with you getting or not getting a part in a music video or any other form of filming. Secondly, you are on the right track with getting your head-shots done and attending modeling/acting school, but even those things are not a guarantee that you'll get in a video. It's all about, do you fit the casting needs of the video that's being shot? Registering with a few casting agencies will help you get the audition or a spot as an extra in a particular video if that agency is handling the casting. Signing with a Personal Manager or a Talent Agent will help you with auditioning for featured or lead spots in Music Videos. Also hard work and professionalism is a big plus. I'm not sure about the New York area, I'm a Personal Manager in Los Angeles and our biggest casting agency here is Central Casting some of my clients have gotten parts in music videos through this agency.