I order my caps from her too. I love the caps from there. I have not asked them to drill for me yet. Could you let me know how they turn out for you when you get them? Like are the holes in the top..
To answer your questions about what you need... I use split rings (that look like mini key chains) and then I have bought ball chains to put them on (like the group buy ones) the customer picks their cap(s) and then I put it on the chain before they leave. But you have to watch out for "sticky" little fingers since the caps are so small.