Make Tech Easier published a tutorial about creating a bootable flash drive with Rufus.

How to Use Rufus to Create a Bootable Flash Drive

It is very difficult to find a CD/DVD rom nowadays, so most people prefer to use a bootable USB drive instead of a CD/DVD drive to install an operating system or software edition. With Windows, there are a ton of software programs to help you create bootable USB drives. Even Microsoft has its own tool. Of all the available tools, Rufus, a free and open-source application, is one of the best. In fact, Rufus is one of the few necessary tools that every Windows user should have in their software catalog. 

How to Use Rufus to Create a Bootable Flash Drive