Step-by-step guide to using the Debian Stretch USB installer to install Debian on a PC.
Here’s how to install the most minimal Debian system possible.
Minimal meaning no X11 and you’re going to have to manually install sudo and vim.
Power on, and look for any prompts to enter bios or the boot menu. Generally pressing a key or combination of keys at boot will take you into a boot menu. In the boot menu select the USB drive.
Pictures are going to work best for the first steps of the installation process: