Puppy Linux is provided as a live CD(.iso file). You can use Puppy Linux as soon as you bootup your computor from the live CD. You may need pressing [Del], [f.1], [f.2], [f.9], or [f.12] at the bootup and set up BIOS or select bootup media depending on your PC. Reffer the documents on your own PC.
Booting up your PC from the Puppy live CD, hopefully automatically starts up the graphical desktop. A GUI dialog for the first setup appears. You may need to change the settings of language, timezone, keyboard layout, and screen size if you want to.
If the PC failed to startup the graphical desktop, try 'Safe mode' at the bootup option (in the 'Advanced menu'). Select the bootup menu(its frendly interface thanks to the Grub4Dos) by using up and down arrow keys. Type 'xorgwizard' after the command prompt appears.
The network connection is to be automatic in case eth0 interface found and DHCP is available. You need to connect the LAN cable before you boot up Puppy.