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You can check the format of a drive inside the Disk Utility Menu bar. It is advised not to change the default format of a Mac hard drive under any circumstances. But you should know the default format for your drive. (Select the disk name, not the volume name indented beneath it.) Click the Partition tab, select your partition, then click the Options button. Disk Utility in macOS Sierra and later chooses a compatible format for you automatically.
MAC OS DISK UTILITY FORMAT SCHEME MAC OS
(Select the disk name, not the volume name indented beneath it.) Then click Erase and choose the GUID partition map scheme and any Mac OS Extended format before erasing.
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MAC OS DISK UTILITY FORMAT SCHEME HOW TO
The "Make sure that your storage device is properly formatted" section of the How to set up and use an external Mac startup disk article provides the following instructions on setting up GPT:
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MS-DOS (FAT) and ExFAT: File systems that are compatible with Windows. Mac OS Extended: The file system used by macOS 10.12 or earlier. Disk Utility on Mac supports several file system formats: Apple File System (APFS): The file system used by macOS 10.13 or later. From your post, I understand that you are trying to set up a GPT (GUID Partition Table) with your flash drive. File system formats available in Disk Utility on Mac. Thanks for using the Apple Support Communities.