How do I smooth, cut, and drill holes in glass found on the beach? I’ve collected lots of glass and stones from the beach near me and would like to make jewelry with it. I’d like to be able to cut the glass into shape, drill small holes into it, and also be able to polish it so it’s smooth and see-through. Can anyone help? Thank you!
For drilling glass, drill bits for tiles (the spear-point type) work. Work wet and go slowly. I've seen them down to 3mm. You need to hold the glass steady, but a cordless drill will be adequate. 

If you want a smooth (as opposed to facetted) piece, jewellers rouge on a cloth will polish glass, worked by hand, though it might take a while. For a little reshaping, such as to remove a sharp edge, you can use wet/dry paper (silicon carbide paper) or emory cloth. Start coarse and work down to a fine grade before polishing. I'm much more familiar with machine polishing, but that's good for flat surfaces.

If you really need to cut it, small cuts can be made with a dremel or similar, with a carbide cutoff wheel. There are also coarse hand saws for tiles that cut glass. They're like a file made of thick wire (coated in abrasive) in a frame, rather than what you'd it think of as a saw.

Safety glasses are a good idea when cutting or drilling.