Bless you for taking these babies in! Be sure to keep them secluded in an area (like your cage) or small bathroom so they cannot run under a bed etc. and hide. Do not leave wet food or special treats out, always bring them in with you to feed. This way the relate to you and food! Here's a wonderful article on how to socialze feral kittens. Hopefully it will help!

http://www.alleycat.org/pdf/socializingferal.pdf