Depends upon what you're planning on shooting. First, on most college campuses, there are plenty of students interested in modeling, especially in exchange for headshots for their acting portfolio or to show off their design and fashion work or in exchange for other trade work. The key is to make it a trade...you shoot their cosplay costumes and you shoot them in the theme you're interested in. The other option is to find a really unique concept or great place to shoot (like the interior of a special location or a waterfall as a backdrop). Otherwise plan on hiring a professional model. You'll get someone who won't flake, will be able to guide you through your amateur mistakes, and assume effective poses so that you actually get some decent results from your first shoot. Once you have good stuff in your portfolio, you have a chance of attracting some models b/c they think they'll get good work from you.