I want to drill very small holes in to old glass, How would i go about drill?
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Carbide bits are the way, but be sure to get the right kind. There are two common kinds of carbide drills: masonry drills, made to use in a hammer drill, and "tile and glass" bits that have spear points. These are easier to start. It helps to use a variable-speed drill and start slow. As someone else mentioned, make sure you're not dealing with tempered glass, whlch will practically explode when you break the surface.
I use carbid drills and turpintine , I have yet to crack one...
And drill it under water so that there is cooling and it acts as lubrication.
I'll second this.
If you're drilling something that's difficult to submerge then you can take some clay and make a wall around the area you want to drill and fill it with water.
Go slowly and try to keep constant pressure. A drill press will help considerably.
Make sure you're not drilling tempered glass, which is impossible to drill without shattering. Tempered glass is often used in modern glass furniture and in car side windows. House windows, mirrors, picture frames, cabinet glass, car windshields, most fish tanks, etc are regular glass.
Buy a diamond drill bit:e.g. http://www.eternaltools.com/drill-bit-glass.htmL
Depending on how small a hole you want to make -- and depending on the glass -- a metal bit specifically made for glass and ceramics might also do the job. These are often available at hardware stores. But the diamond bit, used properly, will probably do a cleaner job.