We answer some of your questions:
"AB" stands for Aurora Borealis - it is an iridescent finish on crystals reminiscent of the natural occurence of a play of colours in the atmosphere during the winter months at the North and South Poles.
Depending on the types of beads or materials you use, sometimes you might find the bead hole to be too small for the beading thread to go through, especially when you are reinforcing the jewellery piece.
If you’re not sure what stringing material to use for a project, put together a small sample before you actually start your project. This might take a little time, but you’ll find that it will save you either having to start over because you don’t like the way your choice is turning out or having to repair a piece later because your choice didn’t hold up. Pull on your sample, move it, drape it and see how it lays. It is always a good idea to visit your local bead shops for assistance.