replacing windows with Ubuntu

[Vinny Ray]

After running Ubuntu on my system from a USB flash drive for 2 days, it 
seems very good.

Now I want to install it permanently on my system.
Is there any good documentation anywhere for someone who knows nothing 
about Linux?

How do I get the windows crap off of my computer and replace it with 
Ubuntu without destroying my system? I'm replacing windows Vista.
Can you actually uninstall a windows operating system completely and 
still be able to detect and install Ubuntu from a USB flash drive?
I would like to erase all traces of microsoft from my computer and start 
fresh.

What is the best way to approach this?

Thanks.