I made the shape of a light saber with cardboard, perfect shape and size and taped it up to keep the shape. i need to wrap it in Fondand and I have no idea what to use so the findant sticks? I know, I'm clueless lol. PLEASE HELP!!

Fondant will stick to foamcore without any kind of glue. You might try it on the cardboard and see if it will stick, if not use a bit of gum glue (tylose mixed with water) or egg white.

you can brush on a thin layer of piping gel, or corn syrup mixed with water as well.