Note that my laptop is 64 bit capable and i have the w8.1 64 bit in the disc.
If I were you, I would make a factory recovery disc of your current operating system before doing a clean install of windows 8. Just in case something goes wrong. To create a recovery disc, type in recovery in Start menu. Usually it will say Create Factory recovery disc or something similar.
Yes, when the disk has been inserted, a box will come up asking you what you want to do. Select the Autostart or Autorun option. Then it will guide you thrpugh the setup process.