This question already has an answer here:
- How do I install Ubuntu? 5 answers
I can't find an Ubuntu installer to format the PC and install it.
This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
Intel uses the same instructions as AMD. You can find in: http://www.ubuntu.com/download/desktop
You can download Ubuntu from here:
My personal choice would be 12.04 as its supported for longer (April 2017) but if you want the latest features download 12.10. The only other choice is 32-bit or 64-bit. It's up to you which you choose to download.
The 32-bit version contains i386 in the name and 64-bit version contains amd64 do not be put off by this both will work with either amd or intel processors.
If you have a new PC that came with Windows 8 installed take a look at Installing Ubuntu on a Pre-Installed UEFI Supported Windows 8 system otherwise you have a choice between a dual boot or Wubi install both are explained in this question How can I install Ubuntu without removing Windows?
Caution if you have a Samsung Laptop that came with Windows 8 pre-installed read this first otherwise you are good to go.