Here is the easiest way to properly make a bootable USB drive with essentially any Linux distro.
Requirements: Two medias, one to install from and one to install to. So either two flash drives or a flash drive and disk.
1: Write all the installation CD files to the first media (the CD if you're using that).
2: Plug in both medias into the computer, and boot from the installation one. This should bring up the installer for that distro.
3: Go through the setup like normal, but choose the second media (the flash drive that you are not installing from) as the target disk to install to.
4: Do the installation normally
5: Shut down and unplug the install media flash drive, leaving the one you installed linux to plugged in.
6: Boot from that flash drive. You're done.
Also if you're a noob at linux in general; just install Ubuntu or Linux Mint or something on that tier that is more user friendly. Kali is designed for entry testing and maining it is sorta dumb unless you actually know at all what you're going to try to do. You can install most of the software available on Kali (and a lot more that isn't readily available on Kali) to pretty much any other popular distro.