I get my bits from
Stained Glass Supplies & Tools - AmeriGlas their not the greatest but they are inexpensive and should last for ten to fifteen holes.
I make a dam out of clay (like a doughnut) place the ring of clay around the hole with about an inch of space around the edge of the the bit. then fill with water about two thirds. start the hole at a 45 degree angle once you feel it start to make a groove straighten the drill perfectly straight up and down. as you go you need to pump the bit up and down every ten to fifteen seconds to let the water get down to the glass. be very careful to not tilt side to side. as you start to break through the water will start to drain so you need someone to add water as you finish. use very light pressure for the last third of the hole. just be patient! also put something under it to catch the plug. the thicker the glass the easier. hope this helps any more questions feel free to ask.
