hae them go to any adult modeling talet agent page, theres always a "become a model" icon
have them fill out the forms, send in their pics, and list YOU as who referred them and if they sign them and they film x amount of completed scenes you get the referral fee
dino made a great thread abut adult model resources here listing agency sites: http://www.xxxporntalk.com/ubbthreads/showflat.php?Cat=&Board=talent&Number=296570&page=0&view=collapsed&sb=5&o=&fpart=1