Plug in pendrive
Use dmesg to find out if it was detected & what device name it was assigned.
If it was detected, it's likely to have been named /dev/sda1
If not, substitute the correct name for the following instructions.
Crate one partition with FAT32 - possibly option 0b from memory
mkefs.dos or mkfs.vfat or mkdosfs or some such command to format the partition.
You now have an empty 256MB flash disk that can be recognised by any OS.
Install whatever software on it you want (Can't be more precise, don't use Fedora - but DamnSmallLinux is a good distro for pendrives as it's only 50MB)
Reboot your PC. On startup, check your BIOS supports booting from a USB flash disk, and make sure it will boot off the flash before it will boot off your own hard drive.
Save the BIOS settings and allow your PC to boot. That should be that.