The important thing with clones is to make sure they are kept humid. Covering them over with a dome does this, creating a nice warm, moist atmosphere for them. If you don't have a cloning dome/tray (which I highly recommend) you can put them in a container and cover over with plastic wrap.
When taking clones, what you want is for the cutting to take roots, not grow new growth up top. Hence some people will trim the bigger fan leaves down as the plant doesn't need to photosynthesize (sp?) that's also why it doesn't need a lot of light. It's concentrating on down below, not up top.
I cut my bigger fan leaves off mostly for size, so they don't take up such a lot of room in the cloning tray.