How many sheets?

Hey! I’m going to order some stuff to try and create my first lamp shade. I would eventually like to do a Tiffany but would like to start with a 6 or however many paneled one around this size a user made.

How many sheets of glass do yall reckon I should buy? I’ve only done classes so I don’t own any glass yet. And can anyone recommend where to buy sheet glass in Vancouver? I’ve heard Kona a lot but that’s online and I worry when it arrives it will be broken.

Also any videos or advice on how to create the bit the shade sits on the lamp?

Thanks!