First of all i gather your friend is willing to try this by his own free will? I would start on a spliff. Its more gradual. He can take the size hit he wants to and hopefully get a nice 1st high.
Please don't introduce him to smoking with a ghetto homemade piece, that would not be a fond first high memory. Get some real glass and then let him take a hit out of that. :] But since that probably isn't going to happen, go with the joint.
first time i smoked was out of a ghetto ass water fall. it was fun. its cool to make and smoke out of gay stupid retarded lame shit when you first start.
do a joint so the hit isn too big i used a bong my first time smoking and i coughed FOREVER my lungs were on fire haha