I'm thinking of getting an EDM, it would be used to cut out parts from a steel sheet. I have a couple of questions because I know nothing about how they work.

I want to cut holes with it, so do I need a diesinker?

How do you clamp the work piece to the machine?

If a part is cut out completly, does the part just fall randomly?

What kind of learning curve am I looking at just to cut out 2d parts?

I have experience with CNC, so I don't think that it is going to be too hard to figure out, but I don't even know where to start looking at the moment for information.